Product:
Cognos BI 10.1.1
IBM HTTPServer 7
AIX

Symptom:
Error when surf to cognos connection on a AIX server with HTTPServer and Kerberos configured.

Error message:
Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, you@your.address and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.
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IBM_HTTP_Server at servername.domain.com Port 80

Possible solution:
The file http.keytab is missing from the /opt/IBM/HTTPServer/conf folder.
This file should contain the kerberos keytab information for that domain account that is set for the Webserver.

Use Putty to access the AIX server.
Go to the /opt/IBM/HTTPServer folder (with command cd /opt/IBM/HTTPServer)
List the contains of the folder (with command ls -l )

Check the http.keytab file is there.
Check the owner of the file, it should in most cases be root.
Check the access rights to the file, in most cases it should be -r–r–r–