The service account is working. The account has not been changed. I am just trying to connect to a SQL2000 server using enterprise manager through citrix. As a Domain admin...

I created the SPN but still get the SSPI error. The only difference is that I am trying to run SQL through Citrix.

What permissions did you have to give for regular users? I have removed all old SPN entries and still get the Cannot generate SSPI error.