1xx - information prompts these status codes indicate a temporary response. The client should be prepared to receive one or more 1xx responses before receiving a regular response. 100-Continue. 101-Switching protocol. 2xx-Successful status code indicates that the server successfully accepted the client request. 200- OK. The client request has been successful. 201 - has been created. 202- Accepted. 203 - Non-authoritative information. 204 - No content. 205 - Reset the content. 206-part of the content. The 3xx-redirect client browser must take more actions to implement the request. For example, a browser may have to request a different page on the server or repeat the request through a proxy server. 301 - The object has been permanently removed, ie permanently redirected. 302 - The object has been temporarily moved. 304 - Not modified. 307 - Temporary redirect. 4xx - Client error occurred and the client seems to have a problem. For example, if the client requests a page that does not exist, the client does not provide valid authentication information. 400 - Wrong request. 401 - Access was denied. IIS defines a number of different 401 errors that indicate more specific causes of errors. These specific error codes are displayed in the browser but are not displayed in the IIS log: 401.1 - Login failed. 401.2 - Server configuration caused login failure. 401.3 - Unauthorized due to ACL restrictions on resources. 401.4 - Filter authorization failed. 401.5-ISAPI/CGI application authorization failed. 401.7– access is denied by the URL authorization policy on the web server. This error code is specific to IIS6.0. 403 - Forbidden access: IIS defines a number of different 403 errors that indicate a more specific cause of the error: 403.1 - Execution access is disabled. 403.2 - Read access is prohibited. 403.3 - Write access is forbidden. 403.4 - SSL is required. 403.5 - Requires SSL 128. 403.6 - IP address is rejected. 403.7 - Requires a client certificate. 403.8 - Site access is denied. 403.9 - Too many users. 403.10 - The configuration is invalid. 403.11-Password change. 403.12 - Deny access to the mapping table. 403.13 - The client certificate was revoked. 403.14-Deny directory listing. 403.15 - Exceeded client access license. 403.16 - The client certificate is not trusted or invalid. 403.17 - The client certificate has expired or is not yet valid. 403.18 - The requested URL could not be executed in the current application pool. This error code is specific to IIS6.0. 403.19 - Cannot perform CGI for clients in this application pool. This error code is specific to IIS6.0. 403.20-Passport login failed. This error code is specific to IIS6.0. 404 - not found. 404.0-(None)– No files or directories found. 404.1 - Unable to access the web site on the requested port. 404.2 - Web Service Extension Lockdown Policy blocks this request. The 404.3-MIME mapping policy blocks this request. 405 - HTTP verb used to access this page is not allowed (method 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– media types not supported. 416– The requested range cannot be met. 417– execution failed. 423– locked error. 5xx-Server Error The server was unable to complete the request due to 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 - Directly requesting Global.asa is not allowed. 500.16– UNC authorization credentials are incorrect. This error code is specific to IIS6.0. 500.18– URL authorization storage cannot be opened. This error code is specific to IIS6.0. 500.100 - Internal ASP error. The 501-header value specifies an unimplemented configuration. The 502-Web server received an invalid response when it was used as a gateway or proxy server. 502.1-CGI application timed out. 502.2 - CGI application error. Application.503 - The service is not available. This error code is specific to IIS6.0. 504 - Gateway timed out. The 505-HTTP version is not supported. FTP1xx - Affirmative Preliminary Reply These status codes indicate that an operation has started successfully, but the client wants to get another reply before proceeding with the new command. 110 restarts the tag reply. 120 service is ready, starting after nnn minutes. 125 The data connection is open and the transfer is starting. 150 file status is normal, ready to open the data connection. 2xx - Affirmative completion of the reply An operation has been successfully completed. The client can execute new commands. 200 commands are determined. 202 did not execute the command, too many commands on the site. 211 system status, or system help reply. 212 directory status. 213 file status. 214 help messages. 215NAME system type, where NAME is the official system name listed in the AssignedNumbers document. 220 Service is ready to execute requests from new users. The 221 service closes the control connection. If appropriate, please log out. The 225 data connection is open and there is no ongoing transmission. 226 close the data connection. The requested file operation was successful (for example, transferring a file or discarding a file). 227 enters passive mode (h1, h2, h3, h4, p1, p2). 230 users have logged in and continue. 250 requested file operation is correct, has been completed. 257 has created “PATHNAME”. 3xx - Affirmative intermediate reply The command was successful, but the server needs more information from the client to complete the processing of the request. 331 username is correct and requires a password. 332 needs to log in to the account. 350 requested file operations are waiting for further information. 4xx - Transient Negative Completion Reply The command was unsuccessful, but the error was temporary. If the client retry the command, it may execute successfully. The 421 service is unavailable and the control connection is being closed. If the service determines that it must be closed, this response will be sent to any command. 425 could not open the data connection. 426Connectionclosed;transferaborted.450 The requested file operation was not performed. The file is not available (for example, the file is busy). 451 Requested operation terminated abnormally: Local error is being processed. 452 The requested operation was not performed. There is not enough system storage space. 5xx-Permanent Negative Completion Reply The command was unsuccessful and the error was permanent. If the client retry the command, the same error will occur again. 500 syntax error, command not recognized. This may include errors such as the command line being too long. 501 has a syntax error in the argument. 502 did not execute the command. 503 wrong command sequence. 504 The command for this parameter was not executed. 530 is not logged in. 532 storage files require an account. 550 did not perform the requested operation. The file is not available (for example, the file was not found, no access). 551 Requested operation terminated abnormally: Unknown page type. 552 Requested file operation terminated abnormally: storage allocation exceeded (for current directory or data set). 553 did not perform the requested operation. File names not allowed. Common FTP Status Codes and Their Causes 150-FTP uses two ports: 21 for sending commands and 20 for sending data. Status code 150 indicates that the server is ready to open a new connection on port 20 and send some data. The 226-command opens a data connection on port 20 to perform operations such as transferring files. The operation completed successfully and the data connection was closed. 230 - The status code is displayed after the client sends the correct password. It indicates that the user has successfully logged in. 331 - The status code is displayed after the client sends the username. This status code is displayed regardless of whether the provided username is a valid account in the system. The 426-command opens the data connection to perform the operation, but the operation has been canceled and the data connection is closed. 530 - This status code indicates that the user cannot log in because the username and password combination is invalid. If you log in with a user account, you may type the wrong username or password, or you may choose to allow only anonymous access. If you log in with an anonymous account, IIS's configuration may deny anonymous access. The 550-command was not executed because the specified file is not available. For example, the file to be GET does not exist, or you try to PUT the file to a directory where you do not have write access.