The portal is configured to kerberos, when a user try to access the portal he gets an error, and in the events viewer I see this error " The portal was unable to complete a request and showed a user the default error page. An unhandled exception was caught. Check the product diagnostic log file and then check the SharePoint log file." I configured the Portal to use NTLM, by changing the Authentication in the central administration page to kerberos, user is getting the same error The Sharepoint -80- application is running under the networkservice account. user is alreday imported from AD and has SID configured. Any Help