404 에러, 웹페이지를 찾을 수 없습니다. 해결 방법 총정리

404 에러(404 Not Found error) 메시지는 개인웹사이트를 방문하거나 불러들일 때 자주 일어난다. 이러한 404에러 메시지를 보면 사용자들은 무심코 해당 웹사이트에 문제가 생겼거나, 사이트 관리자가 서비를 다운시켰놔다고 생각한다. 즉, 404 에러 메시지의 근원을 웹사이트 관리자에게 두는 것이다. 

보통 404 에러 메시지는 획일적이지 않고 아래와 같이 HTTP 404 error가 다양하게 보여진다.

 

• "404 Not Found"
   
• "Error 404"
   
• "The requested URL [URL] was not found on this server."
   
• "HTTP 404"
   
• "Error 404 Not Found"
   
• "404 File or Directory Not Found"
   
• "HTTP 404 Not Found"

국내에서는 보통 nternet explorer에서 웹페이지, Internet Explorer에서 웹 페이지를 표시할 수 없습니다, 인터넷에서웹페이지를표시할수없습니다, 이 페이지를 표시할 수 없습니다., 던파 웹페이지를 표시할수, 인터넷익스플로어에서웹페이지를표시할수없습니다 등을 표시가 된다. 

404 에러 메시지는 어떠한 운영체제이든, 어떠한 인터넷 브라우저에서든 발견이 된다. 그러나 대체적으로 마이크로 소프트의 윈도우 운영체제에 설치 된 브라우저에서 자주 볼 수 있다. 일반적은로 인터넷 익스프로러에서는 The Webpage cannot be found(웹페이지를 찾을 수 없습니다)라는 메시지가 뜨는데 일반적으로 HTTP 404 인터넷 서버 에러를 포함하고 있지만, 단순히 인터넷의 문제나 해당 사이트의 서버의 문제로만 치부할 수 없고 약 400가지의 다른 원인에 의해서 발생될 수 있는 웹브라우저 에러 중 하나이다. 

HTTP 404 에러의 발생원인

404에러 메시지는 보통 마이크로소프트 오피스 앱들의 문서 속에 포함되 링크로 연결을 시키려고 할 때 발생된다(HTTP/1.0 404). 이 메시지는 MS 오피스 프로그램과 과련이 있다. 이러한 경우 윈도우 업데이트가 404 에로를 만들어 내고 그것은 코드 0X80244019 또는 WU_E_PT_HTTP_STATUS_NOT_FOUND. 의 메시지를 나타낸다.  

404 에러는 HTTP 상태 코드이다. 그것은 사용자가 웹사이트를 해당 서버로 부터 불러낼 수 없다는 것을 뜻한다. 기술적으노 에러 404는 클라이언트쪽의 에러이거나 사용자가 기록한 웹사이트 주소가 잘못되었거나 웹사이트가 사이트에 속해 있는 페이지를 삭제했을 때에도 일어난다. 

또는 웹사이트가 자체적으로 페이지를 옮겼거나 새로운 도메인으로 이전한 경우에도 발생될 수 있다. 보통 이러한 일이 발생될 경우에는 자동적으로 변경된 주소로 연결되는 서비스가 제공되지 않는 이상 사용자는 404 에러를 볼 수 밖에 없다. 404에러와 더불어 마이크로소프느 IIS는 에러메시지를 상세히 제공하는 경우도 있는데 소수점 끝으로 숫자가 더 붙는 경우이다. 이것은 아래를 참고하기를 바란다.

404 에러메시지 보기

When you try to access content on a server that is running Internet Information Services (IIS) 7.0, 7.5, or 8.0 by using the HTTP protocol, IIS returns a numeric code that indicates the status of the response. The HTTP status code is recorded in the IIS log. Additionally, the HTTP status code may be displayed in the client browser.

The HTTP status code may indicate whether a request is successful or unsuccessful. The HTTP status code may also reveal the exact reason that a request is unsuccessful.

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More information

Log file locations

By default, IIS 7.0, IIS 7.5, and IIS 8.0 put log files in the following folder:

inetpub\logs\Logfiles

This folder contains separate directories for each World Wide Web website. By default, the log files are created in the directories daily, and the log files are named by using the date. For example, a log file may be named as follows:

exYYMMDD.log

The HTTP status codes

This section describes the HTTP status codes that IIS 7.0, IIS 7.5, and IIS 8.0 use.

Note This article does not list every possible HTTP status code as dictated in the HTTP specification. This article includes only the HTTP status codes that IIS 7.0, IIS 7.5, and IIS 8.0 can send. For example, a custom Internet Server API (ISAPI) filter or a custom HTTP module can set its own HTTP status code. 

1xx - Informational

These HTTP status codes indicate a provisional response. The client computer receives one or more 1xx responses before the client computer receives a regular response. 

IIS 7.0, IIS 7.5, and IIS 8.0 use the following informational HTTP status codes:

• 100 - Continue.
• 101 - Switching protocols.

2xx - Success

These HTTP status codes indicate that the server successfully accepted the request. 

IIS 7.0, IIS 7.5, and IIS 8.0 use the following success HTTP status codes:

• 200 - OK. The client request has succeeded.
• 201 - Created.
• 202 - Accepted.
• 203 - Nonauthoritative information.
• 204 - No content.
• 205 - Reset content.
• 206 - Partial content.

3xx - Redirection

These HTTP status codes indicate that the client browser must take more action to fulfill the request. For example, the client browser may have to request a different page on the server. Or, the client browser may have to repeat the request by using a proxy server. 

IIS 7.0, IIS 7.5, and IIS 8.0 use the following redirection HTTP status codes:

• 301 - Moved permanently.
• 302 - Object moved.
• 304 - Not modified.
• 307 - Temporary redirect.

4xx - Client error

These HTTP status codes indicate that an error occurred and that the client browser appears to be at fault. For example, the client browser may have requested a page that does not exist. Or, the client browser may not have provided valid authentication information. 

IIS 7.0, IIS 7.5, and IIS 8.0 use the following client error HTTP status codes:

• 400 - Bad request. The request could not be understood by the server due to malformed syntax. The client should not repeat the request without modifications.
  
  IIS 7.0, IIS 7.5, and IIS 8.0 define the following HTTP status codes that indicate a more specific cause of a 400 error: 
  • 400.1 - Invalid Destination Header.
  • 400.2 - Invalid Depth Header.
  • 400.3 - Invalid If Header.
  • 400.4 - Invalid Overwrite Header.
  • 400.5 - Invalid Translate Header.
  • 400.6 - Invalid Request Body.
  • 400.7 - Invalid Content Length.
  • 400.8 - Invalid Timeout.
  • 400.9 - Invalid Lock Token.
• 401 - Access denied.
  
  IIS 7.0, IIS 7.5, and IIS 8.0 define several HTTP status codes that indicate a more specific cause of a 401 error. The following specific HTTP status codes are displayed in the client browser but are not displayed in the IIS log: 
  • 401.1 - Logon failed.
  • 401.2 - Logon failed due to server configuration.
  • 401.3 - Unauthorized due to ACL on resource.
  • 401.4 - Authorization failed by filter.
  • 401.5 - Authorization failed by ISAPI/CGI application.
• 403 - Forbidden. 
  
  IIS 7.0, IIS 7.5, and IIS 8.0 define the following HTTP status codes that indicate a more specific cause of a 403 error: 
  • 403.1 - Execute access forbidden.
  • 403.2 - Read access forbidden.
  • 403.3 - Write access forbidden.
  • 403.4 - SSL required.
  • 403.5 - SSL 128 required.
  • 403.6 - IP address rejected.
  • 403.7 - Client certificate required.
  • 403.8 - Site access denied.
  • 403.9 - Forbidden: Too many clients are trying to connect to the web server.
  • 403.10 - Forbidden: web server is configured to deny Execute access.
  • 403.11 - Forbidden: Password has been changed.
  • 403.12 - Mapper denied access.
  • 403.13 - Client certificate revoked.
  • 403.14 - Directory listing denied.
  • 403.15 - Forbidden: Client access licenses have exceeded limits on the web server.
  • 403.16 - Client certificate is untrusted or invalid.
  • 403.17 - Client certificate has expired or is not yet valid.
  • 403.18 - Cannot execute requested URL in the current application pool.
  • 403.19 - Cannot execute CGI applications for the client in this application pool.
  • 403.20 - Forbidden: Passport logon failed.
  • 403.21 - Forbidden: Source access denied.
  • 403.22 - Forbidden: Infinite depth is denied.
  • 403.502 - Forbidden: Too many requests from the same client IP; Dynamic IP Restriction limit reached.
• 404 - Not found. 
  
  IIS 7.0, IIS 7.5, and IIS 8.0 define the following HTTP status codes that indicate a more specific cause of a 404 error:
  • 404.0 - Not found.
  • 404.1 - Site Not Found.
  • 404.2 - ISAPI or CGI restriction.
  • 404.3 - MIME type restriction.
  • 404.4 - No handler configured.
  • 404.5 - Denied by request filtering configuration.
  • 404.6 - Verb denied.
  • 404.7 - File extension denied.
  • 404.8 - Hidden namespace.
  • 404.9 - File attribute hidden.
  • 404.10 - Request header too long.
  • 404.11 - Request contains double escape sequence.
  • 404.12 - Request contains high-bit characters.
  • 404.13 - Content length too large.
  • 404.14 - Request URL too long.
  • 404.15 - Query string too long.
  • 404.16 - DAV request sent to the static file handler.
  • 404.17 - Dynamic content mapped to the static file handler via a wildcard MIME mapping.
  • 404.18 - Querystring sequence denied.
  • 404.19 - Denied by filtering rule.
  • 404.20 - Too Many URL Segments
• 405 - Method Not Allowed.
• 406 - Client browser does not accept the MIME type of the requested page.
• 408 - Request timed out.
• 412 - Precondition failed.

5xx - Server error

These HTTP status codes indicate that the server cannot complete the request because the server encounters an error.

 IIS 7.0, IIS 7.5, and IIS 8.0 use the following server error HTTP status codes:

• 500 - Internal server error. 
  
  IIS 7.0, IIS 7.5, and IIS 8.0 define the following HTTP status codes that indicate a more specific cause of a 500 error:
  • 500.0 - Module or ISAPI error occurred.
  • 500.11 - Application is shutting down on the web server.
  • 500.12 - Application is busy restarting on the web server.
  • 500.13 - Web server is too busy.
  • 500.15 - Direct requests for Global.asax are not allowed.
  • 500.19 - Configuration data is invalid.
  • 500.21 - Module not recognized.
  • 500.22 - An ASP.NET httpModules configuration does not apply in Managed Pipeline mode.
  • 500.23 - An ASP.NET httpHandlers configuration does not apply in Managed Pipeline mode.
  • 500.24 - An ASP.NET impersonation configuration does not apply in Managed Pipeline mode.
  • 500.50 - A rewrite error occurred during RQ_BEGIN_REQUEST notification handling. A configuration or inbound rule execution error occurred.
    Note Here is where the distributed rules configuration is read for both inbound and outbound rules.
  • 500.51 - A rewrite error occurred during GL_PRE_BEGIN_REQUEST notification handling. A global configuration or global rule execution error occurred.
    Note Here is where the global rules configuration is read.
  • 500.52 - A rewrite error occurred during RQ_SEND_RESPONSE notification handling. An outbound rule execution occurred.
  • 500.53 - A rewrite error occurred during RQ_RELEASE_REQUEST_STATE notification handling. An outbound rule execution error occurred. The rule is configured to be executed before the output user cache gets updated.
  • 500.100 - Internal ASP error.
• 501 - Header values specify a configuration that is not implemented.
• 502 - Web server received an invalid response while acting as a gateway or proxy. 
  
  IIS 7.0, IIS 7.5, and IIS 8.0 define the following HTTP status codes that indicate a more specific cause of a 502 error:
  • 502.1 - CGI application timeout.
  • 502.2 - Bad gateway: Premature Exit.
  • 502.3 - Bad Gateway: Forwarder Connection Error (ARR).
  • 502.4 - Bad Gateway: No Server (ARR).
• 503 - Service unavailable. 
  
  IIS 7.0, IIS 7.5, and IIS 8.0 define the following HTTP status codes that indicate a more specific cause of a 503 error:
  • 503.0 - Application pool unavailable.
  • 503.2 - Concurrent request limit exceeded.
  • 503.3 - ASP.NET queue full

Common HTTP status codes and the causes

The following table describes the causes of some common HTTP status codes.

Code	Description	Notes
200	OK	IIS 7.0, IIS 7.5, and IIS 8.0 successfully processed the request.
304	Not modified	The client browser requests a document that is already in the cache, and the document has not been modified since the document was cached. The client browser uses the cached copy of the document instead of downloading the document from the server.
400	Bad request	The Http.sys file blocks IIS 7.0, IIS 7.5, and IIS 8.0 from processing the request because of a problem in the request. Typically, this HTTP status code means that the request contains characters or sequences that are not valid or that the request contradicts the security settings in the Http.sys file.
401.1	Logon failed	The logon attempt is unsuccessful probably because of a user name or a password that is not valid. For more information about how to resolve this problem, click the following article number to view the article in the Microsoft Knowledge Base:   942044 Error message when you try to run a web application that is hosted on IIS 7.0: "HTTP Error 401.1 - Not Found"
401.2	Logon failed due to server configuration	This HTTP status code indicates a problem in the authentication configuration settings on the server. For more information about how to resolve this problem, click the following article number to view the article in the Microsoft Knowledge Base: 942043 Error message when you try to visit a webpage that is hosted on IIS 7.0: "HTTP Error 401.2 - Unauthorized"
401.3	Unauthorized due to ACL on resource	This HTTP status code indicates a problem in the NTFS file system permissions. This problem may occur even if the permissions are correct for the file that you are trying to access. For example, this problem occurs if the IUSR account does not have access to the C:\Winnt\System32\Inetsrv directory. For more information about how to resolve this problem, click the following article number to view the article in the Microsoft Knowledge Base: 942042 Error message when you try to browse a webpage that is hosted on a server that is running IIS 7.0: "HTTP Error 401.3 - Unauthorized"
401.4	Authorization failed by filter	An ISAPI filter does not let the request be processed because of an authorization problem. For more information about how to resolve this problem, click the following article number to view the article in the Microsoft Knowledge Base: 942079 Error message when you visit a website that is hosted on IIS 7.0: "HTTP Error 401.4 - Authorization failed by filter"
401.5	Authorization failed by ISAPI/CGI application	An ISAPI application or a Common Gateway Interface (CGI) application does not let the request be processed because of an authorization problem. For more information about how to resolve this problem, click the following article number to view the article in the Microsoft Knowledge Base: 942078 Error message when you visit a website that is hosted on a computer that is running IIS 7.0: "HTTP Error 401.5 - Authorization failed by ISAPI/CGI application"
403.1	Execute access forbidden	The appropriatelevel of the Execute permission is not granted. For more information about how to resolve this problem, click the following article number to view the article in the Microsoft Knowledge Base: 942065 Error message when you visit a website that is hosted on IIS 7.0: "HTTP Error 403.1 - Forbidden"
403.2	Read access forbidden	The appropriate level of the Read permission is not granted. Verify that you have set up IIS 7.0, IIS 7.5, and IIS 8.0 to grant the Read permission to the directory. Additionally, if you use a default document, verify that the default document exists. For more information about how to resolve this problem, click the following article number to view the article in the Microsoft Knowledge Base:   942036 Error message when you visit a website that is hosted on IIS 7.0: "HTTP Error 403.2 - Forbidden"
403.3	Write access forbidden	The appropriate level of the Write permission is not granted. Verify that the IIS 7.0, IIS 7.5, and IIS 8.0 permissions and the NTFS file system permissions are set up to grant the Write permission to the directory. For more information about how to resolve this problem, click the following article number to view the article in the Microsoft Knowledge Base: 942035 Error message when you visit a website that is hosted on IIS 7.0: "HTTP Error 403.3 - Forbidden"
403.4	SSL required	The request is made over a nonsecure channel, and the web application requires a Secure Sockets Layer (SSL) connection. For more information about how to resolve this problem, click the following article number to view the article in the Microsoft Knowledge Base: 942070 Error message when you visit a website that is hosted on IIS 7.0: "HTTP Error 403.4 - Forbidden"
403.5	SSL 128 required	The server is configured to require a 128-bit SSL connection. But, the request is not sent by using 128-bit encryption. For more information about how to resolve this problem, click the following article number to view the article in the Microsoft Knowledge Base: 942069 Error message when you try to browse a webpage that is hosted on IIS 7.0: "HTTP Error 403.5 - Forbidden"
403.6	IP address rejected	The server is configured to deny access to the current IP address. For more information about how to resolve this problem, click the following article number to view the article in the Microsoft Knowledge Base: 942068 Error message when you visit a website that is hosted on IIS 7.0: "HTTP Error 403.6 - IP Address Rejected"
403.7	Client certificate required	The server is configured to require a certificate for client authentication. But, the client browser does not have an appropriate client certificate installed. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942067 Error message when you try to run a web application that is hosted on a server that is running IIS 7.0: "HTTP Error 403.7 - Forbidden"
403.8	Site access denied	The server is configured to deny requests based on the Domain Name System (DNS) name of the client computer. For more information about how to resolve this problem, click the following article number to view the article in the Microsoft Knowledge Base: 942066 Error message when you visit a website that is hosted on IIS 7.0: "HTTP Error 403.8 - Forbidden"
403.12	Mapper denied access	The page that you want to access requires a client certificate. But, the user ID that is mapped to the client certificate is denied access to the file. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942064 Error message when you visit a website that is hosted on IIS 7.0: "HTTP Error 403.12 - Client Certificate Denied"
403.13	Client certificate revoked	The client browser tries to use a client certificate that was revoked by the issuing certification authority. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942063 Error message when you visit a website that is hosted on IIS 7.0: "HTTP Error 403.13 - Forbidden"
403.14	Directory listing denied	The server is not configured to display a content directory listing, and a default document is not set. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942062 Error message when you visit a website that is hosted on IIS 7.0: "HTTP Error 403.14 - Forbidden"
403.16	Client certificate is untrusted or invalid.	The client browser tries to use a client certificate that is not trusted by the server that is running IIS 7.0, IIS 7.5, or IIS 8.0 or that is not valid. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942061 Error message when you visit a website that is hosted on IIS 7.0: "HTTP Error 403.16 - Forbidden"
403.17	Client certificate has expired or is not yet valid.	The client browser tries to use a client certificate that is expired or that is not yet valid. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942038 Error message when you try to visit a webpage that is hosted on Internet Information Services 7.0: "HTTP Error 403.17 (Forbidden) - The client certificate has expired"
403.18	Cannot execute requested URL in the current application pool.	A custom error page is configured, and the custom error page resides in a different application pool than the application pool of the requested URL. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942037 Error message when you visit a website that is hosted on IIS 7.0: "HTTP Error 403.18 - Forbidden"
403.19	Cannot execute CGI applications for the client browser in this application pool.	The identity of the application pool does not have the Replace a process level token user right. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942048 Error message when you visit a website that is hosted on IIS 7.0: "HTTP Error 403.19 - Forbidden"
404.0	Not found.	The file that you are trying to access was moved or does not exist. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942041 Error message when you try to open a webpage that is hosted on IIS 7.0: "HTTP Error 404.0 - Not Found"
404.2	ISAPI or CGI restriction.	The requested ISAPI resource or the requested CGI resource is restricted on the computer. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942040 Error message when you try to visit a webpage that is hosted on a computer that is running IIS 7.0: "HTTP Error 404.2 – Not Found"
404.3	MIME type restriction.	The current MIME mapping for the requested extension type is not valid or is not configured. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942032 Error message when users visit a website that is hosted on a server that is running Internet Information Services 7.0: "HTTP Error 404.3 - Not Found"
404.4	No handler configured.	The file name extension of the requested URL does not have a handler that is configured to process the request on the Web server. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942052 Error message when you visit a website that is hosted on IIS 7.0: "HTTP Error 404.4 - Not Found"
404.5	Denied by request filtering configuration.	The requested URL contains a character sequence that is blocked by the server. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942053 Error message when you visit a website that is hosted on IIS 7.0: "HTTP Error 404.5 - URL Sequence Denied"
404.6	Verb denied.	The request is made by using an HTTP verb that is not configured or that is not valid. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942046 Error message when you visit a website that is hosted on IIS 7.0: "HTTP Error 404.6 - VERB_DENIED"
404.7	File extension denied.	The requested file name extension is not allowed. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942045 Error message when you try to browse a webpage that is hosted on IIS 7.0: "HTTP Error 404.7 - FILE_EXTENSION_DENIED"
404.8	Hidden namespace.	The requested URL is denied because the directory is hidden. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942047 Error message when you try to visit a webpage that is hosted on IIS 7.0: "HTTP Error 404.8 - HIDDEN_NAMESPACE"
404.9	File attribute hidden.	The requested file is hidden. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942049 Error message when you try to visit a website that is hosted on IIS 7.0: "HTTP Error 404.9 - File Attribute Hidden"
404.10	Request header too long.	The request is denied because the request headers are too long. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942077 Error message when you visit a website that is hosted on a server that is running Internet Information Services 7.0: "HTTP Error 404.10 - REQUEST_HEADER_TOO_LONG"
404.11	Request contains double escape sequence.	The request contains a double escape sequence. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942076 Error message when you visit a website that is hosted on IIS 7.0: "HTTP Error 404.11 - URL_DOUBLE_ESCAPED"
404.12	Request contains high-bit characters.	The request contains high-bit characters, and the server is configured not to allow high-bit characters. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942075 Error message when you visit a website that is hosted on IIS 7.0: "HTTP Error 404.12 - URL_HAS_HIGH_BIT_CHARS"
404.13	Content length too large.	The request contains a Content-Length header. The value of the Content-Length header is larger than the limit that is allowed for the server. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942074 Error message when you visit a website that is hosted on a server that is running Internet Information Services 7.0: "HTTP Error 404.13 - CONTENT_LENGTH_TOO_LARGE"
404.14	Request URL too long.	The requested URL exceeds the limit that is allowed for the server. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942073 Error message when you visit a website that is hosted on IIS 7.0: "HTTP Error 404.14 - URL_TOO_LONG"
404.15	Query string too long.	The request contains a query string that is longer than the limit that is allowed for the server. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942071 Error message when you visit a website that is hosted on a server that is running IIS 7.0: "HTTP Error 404.15 - Not Found"
404.17	Dynamic content mapped to the static file handler.	For more information, click the following article number to view the article in the Microsoft Knowledge Base: 2019689 Error message when you visit a website that is hosted on IIS 7.0: "HTTP Error 404.17 - Not Found"
405.0	Method not allowed.	The request is made by using an HTTP method that is not valid. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942051 Error message when a user visits a website that is hosted on a server that is running Internet Information Services 7.0: "HTTP Error 405.0 - Method not allowed"
406.0	Invalid MIME type.	The request is made by using an Accept header that contains a MIME value that is not valid. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942050 Error message when you visit a website that is hosted on a server that is running Internet Information Services 7.0: "HTTP Error 406 - Not Acceptable"
412.0	Precondition failed.	The request is made by using an If-Match request header that contains a value that is not valid. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942056 Error message when you visit a website that is hosted on Internet Information Services (IIS) 7.0: "HTTP Error 412 - Precondition failed"
500	Internal server error.	This HTTP status code may occur for many server-side reasons. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942031 Error message when you visit a website that is hosted on IIS 7.0: "HTTP Error 500.0 - Internal Server Error"
500.11	Application is shutting down on the web server.	The request is not processed because the destination application pool is shutting down. Wait for the worker process to finish shutting down, and then try the request again. If this problem persists, the web application may be experiencing problems that prevent the web application from shutting down correctly.
500.12	Application is busy restarting on the web server.	The request is not processed because the destination application pool is restarting. This HTTP status code should disappear when you refresh the page. If this HTTP status code appears again after you refresh the page, the problem may be caused by antivirus software that is scanning the Global.asa file. If this problem persists, the web application may be experiencing problems that prevent the web application from restarting correctly.
500.13	Web server is too busy.	The request is not processed because the server is too busy to accept any new incoming requests. Typically, this HTTP status code means that the number of incoming concurrent requests exceeds the number that the IIS 7.0, IIS 7.5, or IIS 8.0 web application can process. This problem may occur because the performance configuration settings are set too low, the hardware is insufficient, or a bottleneck occurs in the IIS 7.0, IIS 7.5, or IIS 8.0 web application. A common troubleshooting method is to generate a memory dump file of the IIS 7.0, IIS 7.5, or IIS 8.0 processes when the error is occurring and then to debug the memory dump file.
500.15	Direct requests for Global.asax are not allowed.	A direct request for the Global.asa file or for the Global.asax file is made. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942030 Error message when you visit a website that is hosted on IIS 7.0: "HTTP Error 500.15 - Direct request for global.asa are not allowed"
500.19	Configuration data is invalid.	This HTTP status code occurs because of a problem in the associated Applicationhost.config file or in the associated Web.config file. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942055 Error message when you visit a website that is hosted on IIS 7.0: "HTTP Error 500.19 - Internal Server Error"
500.100	Internal ASP error.	An error occurs during the processing of an Active Server Pages (ASP) page. To obtain more specific information about the error, disable friendly HTTP error messages in the web browser. Additionally, the IIS log may show an ASP error number that corresponds to the error that occurs. For more information about ASP error messages and about the meaning of ASP error messages, click the following article number to view the article in the Microsoft Knowledge Base: 294271ASP error codes
501.0	Not implemented.	The client browser sends an HTTP-Trace verb, and the server is not configured to process the HTTP-Trace verb. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942058 Error message when you visit a website that is hosted on IIS 7.0: "HTTP Error 501.0 - Not Implemented"
502.1	CGI application timeout.	A CGI application does not return a valid HTTP response in the configured time limit. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942059 Error message when you visit a website that is hosted on IIS 7.0: "HTTP Error 502.1 - Bad Gateway"
502.2	Bad gateway: Premature Exit	A CGI application returns an HTTP response that is not valid to the server that is running IIS 7.0, IIS 7.5, or IIS 8.0. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 942057 Error message when you visit a website that is hosted on IIS 7.0: "HTTP Error 502.2 - Bad Gateway"
503.0	Service unavailable.	The request is sent to an application pool that is currently stopped or that is currently disabled. To resolve this issue, make sure that the destination application pool is started. The event log may give information about why the application pool is stopped or disabled.
503.2	Concurrent request limit exceeded.	The appConcurrentRequestLimit property is set to a value that is lower than the current number of concurrent requests. IIS 7.0, IIS 7.5, and IIS 8.0 do not allow more concurrent requests than the value of the appConcurrentRequestLimit property.

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References

For more information about HTTP status code definitions, visit the following World Wide Web Consortium (W3C) website:

http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10

Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.

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Properties

Article ID: 943891 - Last Review: December 13, 2012 - Revision: 17.1

Applies to

• Microsoft Internet Information Services 7.0
• Microsoft Internet Information Services 7.5
• Microsoft Internet Information Services 8.0

Keywords:

kbtshoot kbinfo KB943891

자 그럼 어떻게 404 에러를 해결할 수 있는지 알아보자.

404 에러 코드 해결방법

1. 첫번째로 가장 쉽게 할 수 있는 것은 웹페이지를 새로고침하는 것이다. 보통 윈도우 익스플로러는 F5가 새로고침 버튼이기 때문에 2-3회정도 새로고침을 해서 해당 서버에 몇번 응답신호를 보내는 것이다. 보통 해당 웹사이트에 이상이 없는 한 이러한 경우 사용자의 컴퓨터 통신의 일시적인 문제나 서버의 문제이라면 해결될 것이다. 

2. 두번째로 할 수 있는것은 본인이 기록한 웹사이트 주소(URL)의 스펠링이 정확한지 체크해보는 것이다. 혹시 다른사이트로부터 링크된 경로를 찾아서 들어온 경우라고 한다면, 링크주소가 잘못된 것일 수 있으니 비슷한 게시물을 찾아 다른 링크로 접속해 본다.

3. 해당 페이지의 주소가 몇개의 슬러시(/)로 확장되어 있다면 하나씩 지워본다. 예를들 만약 주소가 www.web.com/a/b/c라면 최초 c를 삭제해서 www.web.com/a/b로 들어간다. 그렇게 해서도 문제가 생기면 www.web.com/a로 들어가고 그것도 안되면 www.web.com 도메인만 기록해서 들어가 원하는 정보를 찾는다. 한가지 팁을 드리자면, 웹사이트 도메인만으로 들어가졌다면 보통 사이트에는 검색툴이 있다 그것을 이용해 정보를 찾는 것도 방법이다. 

4. 개방성이 높은 검색엔진을 이용해서 원하는 정보를 검색해 본다. 국내 포털들은 상대적으로 정보 수집이 제한적이기 때문에 타 포털의 자료를 수집하고 출력하는데 구조적으로 문제가 있다. 따라서 구글이나 빙(Bing) 같은 개방성이 높은 검색엔진을 통해서 해당 주소를 검색하거나 키워드를 넣어 검색을 해본다.

5. 사용자가 해볼 수 있는 가장 확실한 방법은 바로 인터넷 브라우저의 캐시를 삭제하는 것이다. 예를 들어 다른 컴퓨터에서는 보이는 페이지가 유난히 자신의 컴퓨터에서 404 에러로 표시가 된다면 이것을 일반적을 캐시문제이다. 이것은 모바일기기 역시 그러하다. 스마트폰으로 보이는 페이지가 타블렛에서 안보이는 것도 같은 이유이다. 브라우저 설정에 들어가서 "기록 삭제", "쿠키 삭제" 등을 해보는 것을 권한다.

6. 만약 특정 사이트가 아니라 어떠한 페이지를 접속하더라도 404에러가 발생된다면 DNS 서버 주소를 변경해보아야 한다. 특히 다른 네트워크에서 접속이 잘 되는 것이라면 자신의 DNS 서버가 문제가 있을 수 있다. 일단 자신의 스마트폰으로 접속해보고 잘 접속이 된다면, 자신의 컴퓨터의 DNS 서버를 수정하도록 한다. 

또한 가정용 인터넷 라인이 아니라 공공장소나 회사에서 이러한 일이 발생된 경우에는 회사측에서 특정한 사이트 도메인을 차단한 경우가 있다. 이러한 경우에는 관리자에게 문의를 해보아야 한다. 

7. 마지막으로 모든 시도를 해도 문제가 해결되지 않는다면, 해당 웹사이트가 삭제되었거나 또는 다른 주소로 이전되었을 가능성이 있다. 이것을 확인할 수 있는 간단한 방법은 후이즈를 통해서 해당 도메인을 검색해 보는 것이다. 후이즈에 도메인을 검색하면 도메인 정보가 나온다. 

- See more at: http://mutizen.tistory.com/1211#sthash.iPYQF5DH.dpuf