Hi @anoop213,
this is pure Kerberos question, not even related to SAS at this point. I would really ask your system admins about that.
A brief attempt to help you:
It seems to me as there is some mismatch between the keys in the keytab and the krb5 config file. Which one is the last you changed? the krb5 config?
Also. maybe you might need to register the keys, if they are not even there, in they keytab file.
I am not a Kerberos expert, but this is what I would do: first ensure krb5 is the final one, then ensure my keytab is correct, then update what ever config necessary in SAS or other applications.