Re: multiple Kerberos Server Principals from 1 instance of pgadmin

PGKRBSRVNAME is typically either 'postgres' or 'POSTGRES', depending on
if you are dealing with Active Directory clients or not.  I agree that
it's theoretically possible that you might need to be able to configure
PGKRBSRVNAME on a per-server/cluster basis, but you definitely don't
need to be able to do so on a per-database basis and the PGKRBSRVNAME
has absolutely nothing to do with the user's username, nor the unix user
that the server actually runs as.

What, exactly, are you thinking that value would be set to?

Can you show what klist -k /path/to/keytab on the PG server returns?