Meaning of IIS status code (HTTP request)

Meaning of IIS status code (HTTP request)

 
Summary
When a user attempts to access content on a server that is running Internet Information Service (IIS) through HTTP or file transfer protocol (FTP, IIS returns a digital code indicating the Request status. This status code is recorded in IIS logs and may also be displayed in a web browser or an FTP client. The status code can indicate whether the request is successful or not, and reveal the exact cause of the Request failure.
More information
Log File Location
By default, IIS stores its log files in the % WINDIR/system32/logfiles folder. Each WWW site and FTP site have a separate directory under this directory. By default, log files are created in these directories every day and named by date (for example, exyymmdd. Log ).
HTTP
1xx-Information prompt
These status codes indicate temporary responses. Before receiving a regular response, the client should be prepared to receive one or more 1xx responses.
100-continue.
101-switch protocol.
2XX-success
This type of Status Code indicates that the server successfully accepts client requests.
200-OK. The client request is successful.
201-created.
202-accepted.
203-non-authoritative information.
204-NO content.
205-Reset content.
206-part of content.
3xx-redirection
The client browser must perform more operations to implement the request. For example, the browser may have to request different pages on the server or repeat the request through the proxy server.
301-the object has been permanently removed, I .e., permanent redirection.
302-the object has been temporarily moved.
304-not modified.
307-temporary redirection.
4xx-client Error
The client seems to be faulty when an error occurs. For example, the client does not provide valid authentication information for a page that does not exist in a request. 400-Incorrect request.
401-Access denied. IIS defines many different 401 errors, which indicate more specific error causes. These specific error codes are displayed in the browser but not in the IIS log:
401.1-Logon Failed.
401.2-login failed due to server configuration.
401.3-the ACL is not authorized due to resource restrictions.
401.4-filter authorization failed.
401.5-An error occurred while authorizing the ISAPI/cgi application.
401.7-the access is rejected by the URL Authorization Policy on the Web server. This error code is dedicated to iis6.0.
403-Access prohibited: IIS defines many different 403 errors, which indicate more specific error causes:
403.1-the execution access is forbidden.
403.2-Read access is forbidden.
403.3-write access is forbidden.
403.4-require SSL.
403.5-ssl128 is required.
403.6-the IP address is rejected.
403.7-client certificate required.
403.8-site access is denied.
403.9-too many users.
403.10-the configuration is invalid.
403.11-change the password.
403.12-access to the ing table is denied.
403.13-the client certificate is revoked.
403.14-reject the directory list.
403.15-the access permission of the client is exceeded.
403.16-the client certificate is untrusted or invalid.
403.17-the client certificate has expired or has not yet taken effect.
403.18-the requested URL cannot be executed in the current application pool. This error code is dedicated to iis6.0.
403.19-CGI cannot be executed for clients in this application pool. This error code is dedicated to iis6.0.
403.20-logon to passport failed. This error code is dedicated to iis6.0.
404-not found.
404.0-(none)-No file or directory found.
404.1-unable to access the web site on the requested port.
404.2-the Web service extended locking policy blocks this request.
404.3-the mime ing policy blocks this request.
405-HTTP predicates used to access this page are not allowed (methods are not allowed)
406-the client browser does not accept the MIME type of the requested page.
407-proxy authentication is required.
412-precondition failed.
413-The Request Entity is too large.
414-the request URI is too long.
415-unsupported media type.
416-the requested range cannot be met.
417-execution failed.
423-locking error.
5xx-Server Error
The server cannot complete the request because of an error.
500-internal server error.
500.12-the application is busy restarting on the Web server.
500.13-the Web server is too busy.
500.15-Direct Request to global. ASA is not allowed.
The 500.16-unc authorization credential is incorrect. This error code is dedicated to iis6.0.
500.18-the URL-authorized storage cannot be opened. This error code is dedicated to iis6.0.
500.100-Internal ASP error.
501-the header value specifies the unimplemented configuration.
502-the Web server received an invalid response when used as a gateway or proxy server.
502.1-CGI application timeout.
502.2-CGI application error. Application.
503-the service is unavailable. This error code is dedicated to iis6.0.
504-gateway timeout.
The 505-http version is not supported.
FTP
1xx-Affirmative preliminary reply
These status codes indicate that an operation has started successfully, but the client wants to receive another response before continuing to operate the new command.
110 restart mark the reply.
120 the service is ready and starts in NNN minutes.
125 the data connection is enabled and transmission is starting.
150 the file is in normal state and you are ready to open the data connection.
2XX-a positive response
An operation has been completed successfully. The client can execute new commands. 200 command OK.
202 if no command is executed, there are too many commands on the site.
211 system status or system help reply.
212 directory status.
213 File status.
214 help message.
215name: system type. name indicates the formal system name listed in assignednumbers.
220 the service is ready to execute new user requests.
221 close the control connection. If appropriate, log out.
225 the data connection is opened and there is no transmission in progress.
226 close the data connection. The requested file operation has been successful (for example, transferring a file or dropping a file ).
227 enter the passive mode (H1, H2, H3, H4, P1, P2 ).
230 The user has logged on and continues.
250 the requested file operation is correct and has been completed.
257 "pathname" has been created ".
3xx-Affirmative intermediate reply
The command is successful, but the server needs more information from the client to process the request. 331 the user name is correct and the password is required.
332 You need to log on to the account.
350 the requested file operation is waiting for further information.
4xx-completion of transient Negation
The command fails, but the error is temporary. If the client retries the command, it may be executed successfully. 421 the service is unavailable and the control connection is being closed. If the Service determines that it must be disabled, this response will be sent to any command.
425 data connection cannot be enabled.
426 connectionclosed; transferaborted.
450 file operations not requested. The file is unavailable (for example, the file is busy ).
451 request operation exception termination: processing local error.
452 the requested operation is not performed. Insufficient system storage space.
5xx-permanent completion reply
The command fails. The error is permanent. If the client retries the command, the same error will occur again. 500 syntax error. The command cannot be identified. This may include errors such as too long command lines.
501 syntax error in the parameter.
502 the command is not executed.
503 error command sequence.
504 the command for this parameter is not executed.
530 not logged on.
532 accounts are required to store files.
550 the requested operation is not performed. File is unavailable (for example, the file is not found and no access permission is available ).
551 exceptional request termination: Unknown page type.
552 the requested file operation ended abnormally: exceeds Storage Allocation (for the current directory or dataset ).
553 the requested operation is not performed. The file name is not allowed.
Common FTP status code and Its Causes
150-ftp uses two ports: 21 for sending commands and 20 for sending data. Status Code 150 indicates that the server is preparing to open a new connection on Port 20 and send some data.
226-the command opens a data connection on Port 20 to perform operations, such as file transfer. This operation is successfully completed and the data connection is closed.
230-the status code is displayed after the client sends the correct password. It indicates that the user has successfully logged on.
331-the status code is displayed after the client sends the user name. This status code is displayed no matter whether the user name is a valid account in the system.
426-the command opens the data connection to perform the operation, but the operation has been canceled and the data connection has been closed.
530-the status code indicates that the user cannot log on because the combination of the user name and password is invalid. If you log on with a user account, you may enter the wrong user name or password, or you may choose to allow anonymous access only. If you log on with an anonymous account, the IIS configuration may reject anonymous access.
550-the command is not executed because the specified file is unavailable. For example, the file to get does not exist, or you try to put the file to a directory without the write permission.