I installed the Service Pack 2 for WSS 3.0 and MOSS 2007. When I run the Configuration Wizard I get the error:An exception of type System.Security.Principal.IdentityNotMappedException was thrownat step 5.I have checked the App Pool accounts and I have given permissions to the WSS_Admin_WPG and WSS_WPG accounts appropriately.Why does this occur? And how do I fix so I can get SharePoint back online?

Hi Please go to services.mmc to check if the workstation service is started. If no, please restart it to see if this works. If yes, please collect the error messages in the event viewer and ULS log. Let me know the result, thanks. Lu Zou

Which environment are you installing in an AD environment or NT4?

Installing inan ADenvironment. The workstation service was started and running fine.I've restored the server from a backup since posting because it just would not work.I'll try the SP2 install again collect the logs.

"An exception of type system.security.principal.identitynotmappedexception was thrown" SharePoint Sharing my trouble shooting experience with SharePoint. I was running the SharePoint configuration wizard after a issue being report by a user, issue was: Failed to register SharePoint services. Error message: "An exception of type System.Security.Principal.IdentityNotMappedException was thrown. Additional exception information: Some or all identity references could not be translated." After some investigation discovered that the "SharePoint Central Administration v3"- Application Pool in IIS had the wrong username and password configured in the Identity tab (must be result of username / password change). Fixed that, restarted the App Pool, ran the SharePoint wizard again and it all got resolved! Referring to the SharePoint manual, the problem could also have been resolved by using "stsadm.exe -o updatefarmcredentials -userlogin -password".

I have a slightly different variation of this error message that we cannot figure out. Mine shows up as: Failed to initiate the upgrade sequence. An exception of type System.Security.Principal.IdentityNotMappedException was thrown. Additional exception information: Some or all identity references could not be translated. System.Security.Principal.IdentityNotMappedException: Some or all identity references could not be translated.