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When ArcGIS Server services that are secured with token-based authentication are running on Internet Information Services (IIS) 7, requesting the service WSDL in browser may display the message:
"The custom error module does not recognize this error."
This error may occur when the ArcGIS Server Web services are installed on IIS 7 (Windows Vista or Windows Server 2008). The error displays when the service is secured and requires a token to access the service. The browser or other client may display the message when trying to access the WSDL or otherwise requesting data from the service.
The cause of the error is that the ArcGIS Server Web service is returning an error code of 499, with a message of "Token required". On IIS 7, the error code 499 is not registered as a valid error code by default. When the browser is not running on the Web server machine, IIS returns "The custom error module does not recognize this error" instead of the actual code and token-required message. For a browser running on the IIS Web server machine, the server, by default, returns the original 499 error code and token-required message.
Add the error code to IIS 7 so that it displays the token-required message to clients. Users must still acquire and use a token to access the secured service. For details on tokens, contact the ArcGIS Server administrator or see the ArcGIS Server Help.
To add the error code to IIS 7: