]> 12/4/2025 1100InformationalContinueInitial part of the request has been received and hasn't yet been rejected by the server. The server intends to send a final response after the request has been fully received and acted upon.FALSE 2101InformationalSwitching ProtocolsServer understands and is willing to comply with client's request for a change in the application protocol being used.FALSE 3200SuccessOK; The client request has succeededThe client request was successfully processed.FALSE 4201SuccessCreatedThe client request has been fulfilled and has resulted in one or more new resources being created.FALSE 5202SuccessAcceptedThe client request has been accepted for processing, but the processing hasn't been completed.FALSE 6203SuccessNon-authoritative informationThe client request was successful but the enclosed content has been modified from the response of the origin server.FALSE 7204SuccessNo contentThe server has successfully fulfilled the request and that there's no additional content to send in the response content.FALSE 8205SuccessReset contentThe server has fulfilled the request and expects the user agent to reset the "document view," which caused the request to be sent, to its original state as received from the origin server.FALSE 9206SuccessPartial contentThe server is successfully fulfilling a range request for the target resource by transferring one or more parts of the selected representation.FALSE 10207SuccessMulti-Status (WebDav)FALSE 11301RedirectionMoved PermanentlyThe target resource has been assigned a new permanent URI and any future references to this resource ought to use one of the enclosed URIs.FALSE 12302RedirectionObject movedThe target resource resides temporarily under a different URI. Since the redirection might be altered on occasion, the client ought to continue to use the target URI for future requestsFALSE 13304RedirectionNot modifiedA conditional GET or HEAD request has been received and would have resulted in a 200 (OK) response if it weren't for the fact that the condition evaluated to false.FALSE 14307RedirectionTemporary redirectThe client browser requests a document that is already in the cache. And the document hasn't been modified since it was cached. The client browser uses the cached copy of the document instead of downloading the document from the server.FALSE 15400Client ErrorBad requestThe request couldn't be understood by the server due to malformed syntax. The client shouldn't repeat the request without modifications. For more information, see Troubleshooting HTTP 400 Errors in IIS.FALSE 16400.1Client ErrorInvalid Destination HeaderTRUE 17400.10Client ErrorInvalid X-Forwarded-For (XFF) headerTRUE 18400.11Client ErrorInvalid WebSocket requestTRUE 19400.2Client ErrorInvalid Depth HeaderTRUE 20400.3Client ErrorInvalid If HeaderTRUE 21400.4Client ErrorInvalid Overwrite HeaderTRUE 22400.5Client ErrorInvalid Translate HeaderTRUE 23400.6Client ErrorInvalid Request BodyTRUE 24400.601Client ErrorBad client request (ARR)TRUE 25400.602Client ErrorInvalid time format (ARR)TRUE 26400.603Client ErrorParse range error (ARR)TRUE 27400.604Client ErrorClient gone (ARR)TRUE 28400.605Client ErrorMaximum number of forwards (ARR)TRUE 29400.606Client ErrorAsynchronous competition error (ARR)TRUE 30400.7Client ErrorInvalid Content LengthTRUE 31400.8Client ErrorInvalid TimeoutTRUE 32400.9Client ErrorInvalid Lock TokenTRUE 33401Client ErrorAccess denied; IIS Defines several different 401 errors that indicate a more specific cause of the error; These specific error codes are displayed in the browser but are not displayed in the IIS logThe request hasn't been applied because it lacks valid authentication credentials for the target resource.FALSE 34401.1Client ErrorLogon FailedThe logon attempt is unsuccessful probably because of a user name or a password that is invalid.TRUE 35401.2Client ErrorLogon failed due to server configurationThis HTTP status code indicates a problem in the authentication configuration settings on the server.TRUE 36401.3Client ErrorUnauthorized due to ACL on resourceThis HTTP status code indicates a problem in the NTFS file system permissions. This problem might occur even if the permissions are correct for the file that you try to access. For example, this problem occurs if the IUSR account doesn't have access to the C:\Winnt\System32\Inetsrv directory.TRUE 37401.4Client ErrorAuthorization failed by filterAn Internet Server Application Programming Interface (ISAPI) filter doesn't let the request be processed because of an authorization problem.TRUE 38401.5Client ErrorAuthorization failed by ISAPI/CGI applicationAn ISAPI application or a Common Gateway Interface (CGI) application doesn't let the request be processed because of an authorization problem.TRUE 40401.501Client ErrorAccess denied: concurrent request rate limit reachedDynamic IP Restriction: too many concurrent requests were made from the same client IP.TRUE 41401.502Client ErrorAccess denied: maximum request rate limit reachedDynamic IP Restriction: the maximum number of requests from the same client IP within a specified time limit was reached.TRUE 42401.503Client ErrorAccess denied: IP address deniedIP Restriction: the client IP address is included in the deny list.TRUE 43401.504Client ErrorAccess denied: host name deniedIP Restriction: the client host name is included in the deny list.TRUE 39401.7Client ErrorAccess denied by URL authorization policy on the Web server; This error code is specific to IIS 6.0TRUE 44403Client ErrorForbidden; IIS defines different 403 records that indicate a more specific cause of the errorThe server understood the request but refuses to fulfill it.FALSE 45403.1Client ErrorExecute access forbiddenThe appropriate level of the Execute permission isn't granted.TRUE 54403.10Client ErrorForbidden: Execute access deniedThe web server is configured to deny "Execute" access.TRUE 55403.11Client ErrorForbidden: Password changedA password has been changed.TRUE 56403.12Client ErrorMapper denied accessThe 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.TRUE 57403.13Client ErrorClient certificate revokedThe client browser tries to use a client certificate that was revoked by the issuing certification authority.TRUE 58403.14Client ErrorDirectory listing deniedThe server isn't configured to display a content directory listing, and a default document isn't set. For more information, see HTTP Error 403.14.TRUE 59403.15Client ErrorClient access licenses exceededThe number of client access licenses has exceeded the limits on the web server.TRUE 60403.16Client ErrorClient certificate is untrusted or invalidThe client browser tries to use an invalid client certificate. Or the server that is running IIS doesn't trust the client certificate. For more information, see HTTP Error 403.16.TRUE 61403.17Client ErrorClient certificate has expired or is not yet validThe client browser tries to use a client certificate that is expired or that isn't yet valid.TRUE 62403.18Client ErrorCannot execute requested URL in the current application poolA custom error page is configured. And the application pool of the customer error page is different with the application pool of the requested URL.TRUE6 63403.19Client ErrorCannot execute CGI applications for the client browser in this application poolThe identity of the application pool doesn't have the Replace a process level token user right.TRUE6 46403.2Client ErrorRead access forbiddenThe appropriate level of the Read permission isn't granted. Verify that you have set up IIS to grant the Read permission to the directory. Additionally, if you use a default document, verify that the default document exists.TRUE 64403.20Client ErrorForbidden: Passport logon failedClient requests using passport logon aren't allowed.TRUE6 65403.21Client ErrorForbidden: Source access deniedWebDAV requests to the source code of a resource aren't allowed.TRUE 66403.22Client ErrorForbidden: Infinite depth is deniedWebDAV requests with an infinite depth aren't allowed.TRUE 47403.3Client ErrorWrite access forbiddenThe appropriate level of the Write permission isn't granted. Check the IIS permissions and the NTFS file system permissions. Make sure that they're set up to grant the "Write" permission to the directory.TRUE 48403.4Client ErrorSSL requiredThe request is made over a non-secure channel. But the web application requires a Secure Sockets Layer (SSL) connection.TRUE 49403.5Client ErrorSSL 128 requiredThe server is configured to require a 128-bit SSL connection. But, the request isn't sent by using 128-bit encryption.TRUE 67403.501Client ErrorForbidden: concurrent request rate limit reachedDynamic IP Restriction: too many concurrent requests were made from the same client IP.TRUE 68403.502Client ErrorForbidden: maximum request rate limit reachedDynamic IP Restriction: the maximum number of requests from the same client IP within a specified time limit was reached.TRUE 69403.503Client ErrorForbidden: IP address deniedIP Restriction: the client IP address is included in the deny list.TRUE 70403.504Client ErrorForbidden: host name deniedIP Restriction: the client host name is included in the deny list.TRUE 50403.6Client ErrorIP Address rejectedThe server is configured to deny access to the current IP address.TRUE 51403.7Client ErrorClient certificate requiredThe server is configured to require a certificate for client authentication. But the client browser doesn't have an appropriate client certificate installed. For more information, see HTTP error 403.7.TRUE 52403.8Client ErrorSite access deniedThe server is configured to deny requests based on the Domain Name System (DNS) name of the client computer. For more information, see Dynamic IP Address restrictions.TRUE 53403.9Client ErrorToo many usersToo many clients are trying to connect to the web server.TRUE 71404Client ErrorNot foundThe origin server didn't find a current representation for the target resource or isn't willing to disclose that one exists.FALSE 80404.1Client ErrorSite Not FoundThe requested website doesn't exist.TRUE 81404.10Client ErrorRequest header too longThe request is denied because the request headers are too long.TRUE 82404.11Client ErrorRequest contains double escape sequenceThe request contains a double escape sequence.TRUE 83404.12Client ErrorRequest contains high-bit charactersThe request contains high-bit characters, and the server is configured not to allow high-bit characters.TRUE 84404.13Client ErrorContent length too largeThe 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, see HTTP Error 404.13 - CONTENT_LENGTH_TOO_LARGE.TRUE 85404.14Client ErrorRequest URL too longThe requested URL exceeds the limit that is allowed for the server.TRUE 86404.15Client ErrorQuery string too longThe request contains a query string that is longer than the limit that is allowed for the server.TRUE 87404.16Client ErrorWebDAV request sent to the static file handlerA WebDAV request wasn't processed by a WebDAV feature and was sent to the static file handler.TRUE 88404.17Client ErrorDynamic content mapped to the static file handlerFor more information, see HTTP Error 404.17 - Not Found.TRUE 89404.18Client ErrorQuery string sequence deniedThe request contains a query string sequence that isn't allowed.TRUE 90404.19Client ErrorDenied by filtering ruleThe request was denied due to a Request Filtering rule.TRUE 72404.2Client ErrorISAPI or CGI restrictionThe requested ISAPI resource or the requested CGI resource is restricted on the computer. For more information, see HTTP Error 404.2.TRUE 91404.2Client ErrorWeb service extension lockdown policy prevents this requestTRUE 92404.20Client ErrorToo Many URL SegmentsThe request contains too many URL segments.TRUE 73404.3Client ErrorMIME type restrictionThe current MIME mapping for the requested extension type is invalid or isn't configured.TRUE 93404.3Client ErrorMIME map policy prevents this requestTRUE 74404.4Client ErrorNo handler configuredThe file name extension of the requested URL doesn't have a handler that is configured to process the request on the Web server.TRUE 75404.5Client ErrorDenied by request filtering configurationThe requested URL contains a character sequence that is blocked by the server.TRUE 94404.501Client ErrorNot found: concurrent request rate limit reachedDynamic IP Restriction: too many concurrent requests were made from the same client IP.TRUE 95404.502Client ErrorNot found: maximum request rate limit reachedDynamic IP Restriction: the maximum number of requests from the same client IP within a specified time limit was reached.TRUE 96404.503Client ErrorBlocked IP AddressIP Restriction: the client IP address is included in the deny list.TRUE 97404.504Client ErrorNot found: host name deniedIP Restriction: the client host name is included in the deny list.TRUE 76404.6Client ErrorVerb deniedThe request is made by using an HTTP verb that isn't configured or that isn't valid.TRUE 77404.7Client ErrorFile extension deniedThe requested file name extension isn't allowed.TRUE 78404.8Client ErrorHidden namespaceThe requested URL is denied because the directory is hidden.TRUE 79404.9Client ErrorFiles attribute hiddenThe requested file is hidden.TRUE 98405Client ErrorHTTP Method not allowedThe method received in the request-line is known by the origin server but not supported by the target resource.FALSE 99406Client ErrorClient browser does not accept the MIME type of the requested pageThe client browser doesn't accept the MIME type of the requested resource.FALSE 100407Client ErrorProxy authentication requiredFALSE 101408Client ErrorRequest timed outThe server didn't receive a complete request message within the time that it was prepared to wait.FALSE 102412Client ErrorPrecondition failedOne or more conditions given in the request header fields evaluated to false when tested on the server.FALSE 103413Client ErrorRequest entity too largeThe HTTP request payload is too large.FALSE 104414Client ErrorRequest-URI too longFALSE 105415Client ErrorUnsupported media typeFALSE 106416Client ErrorRequested range not satisfiableFALSE 107417Client ErrorExecution failedFALSE 108423Client ErrorLocked errorFALSE 109500Server ErrorInternal server errorThe server encountered an unexpected condition that prevented it from fulfilling the request.FALSE 110500.0Server ErrorModule or ISAPI error occurredThis HTTP status code may occur for many server-side reasons. For more information, see HTTP Error 500.0 - Internal Server Error.TRUE 111500.1Server ErrorInternal ASP errorTRUE 112500.100Server ErrorInternal ASP errorAn 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.TRUE 113500.11Server ErrorApplication is shutting down on the web serverThe request isn't 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.TRUE 114500.12Server ErrorApplication is busy restarting on the Web serverThe request isn't 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.TRUE 115500.13Server ErrorWeb server is too busyThe request isn't 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 web application can process. This problem may occur when the performance configuration settings are set too low, the hardware is insufficient, or a bottleneck occurs in the IIS web application. A common troubleshooting method is to generate a memory dump file of the IIS processes when the error is occurring and then to debug the memory dump file.TRUE 116500.15Server ErrorDirect requests for Global.asa are not allowedA direct request for the Global.asa file or for the Global.asax file is made.TRUE 117500.16Server ErrorUNC authorization credentials incorrectTRUE6 118500.18Server ErrorURL authorization store cannot be openedTRUE6 119500.19Server ErrorData for this file is configured improperly in the metabaseThis HTTP status code occurs because of a problem in the associated applicationhost.config file or in the associated Web.config file. For more information, see HTTP Error 500.19.TRUE 120500.21Server ErrorModule not recognizedTRUE 121500.22Server ErrorAn ASP.NET httpModules configuration does not apply in Managed Pipeline modeTRUE 122500.23Server ErrorAn ASP.NET httpHandlers configuration does not apply in Managed Pipeline modeTRUE 123500.24Server ErrorAn ASP.NET impersonation configuration does not apply in Managed Pipeline modeTRUE 124500.50Server ErrorA rewrite error occurred during RQ_BEGIN_REQUEST notification handling. A configuration or inbound rule execution error occurredHere's where the distributed rules configuration is read for both inbound and outbound rules.TRUE 125500.51Server ErrorA rewrite error occurred during GL_PRE_BEGIN_REQUEST notification handling. A global configuration or global rule execution error occurredHere's where the global rules configuration is read.TRUE 126500.52Server ErrorA rewrite error occurred during RQ_SEND_RESPONSE notification handling. An outbound rule execution occurredTRUE 127500.53Server ErrorA 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 updatedTRUE 128501Server ErrorHeader values specify a configuration that is not implementedThe server doesn't support the functionality required to fulfill the request.FALSE 129502Server ErrorWeb server received an invalid response while acting as a gateway or proxyThe server, while acting as a gateway or proxy, received an invalid response from an inbound server it accessed while attempting to fulfill the request. For more information, see Troubleshooting 502 Errors in ARR.FALSE 130502.1Server ErrorCGI application timeoutTRUE 131502.2Server ErrorError in CGI applicationTRUE 133502.2Server ErrorBad gateway: Premature ExitTRUE 134502.2Server ErrorMap request failure (ARR)TRUE 135502.3Server ErrorBad Gateway: Forwarder Connection Error (ARR)TRUE 136502.3Server ErrorWinHTTP asynchronous completion failure (ARR)TRUE 137502.4Server ErrorBad Gateway: No Server (ARR)TRUE 138502.4Server ErrorNo server (ARR)TRUE 139502.5Server ErrorWebSocket failure (ARR)TRUE 140502.6Server ErrorForwarded request failure (ARR)TRUE 141502.7Server ErrorExecute request failure (ARR)TRUE 142503Server ErrorService unavailableThe server is currently unable to handle the request due to a temporary overload or scheduled maintenance, which will likely be alleviated after some delay.FALSE6 143503.0Server ErrorApplication pool unavailableThe request is sent to an application pool that is currently stopped or 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.FALSE 144503.2Server ErrorConcurrent request limit exceededThe appConcurrentRequestLimit property is set to a value that is lower than the current number of concurrent requests. IIS doesn't allow more concurrent requests than the value of the appConcurrentRequestLimit property.FALSE 145503.3Server ErrorASP.NET queue fullFALSE 146503.4Server ErrorFastCGI queue fullFALSE 147504Server ErrorGateway timeoutFALSE 148505Server ErrorHTTP version not supportedFALSE