Kerb. not working on secondary IDS, works on primary IDS

I see the following error in the Identity server logs.

<msg>No Kerberos Principal found in the token</msg></amLogEntry>
<amLogEntry seq="2945" d="2012-02-13T15:47:57Z" lg="Application" lv="SEVERE" th="18" ids="AM#200104112: AMDEVICEID#056E157F209175C2: AMAUTHID#BF46E4CBA66A77C82F3B924F67C1EA69: " ><msg>No user matched in the userstore(s)</msg></amLogEntry>


Kerberos works fine on the Primary identity server cluster. I verified that the settings are similar to the primary identity server, passwordfetch class is specified. The keytab is identical to the primary IDS (with a different name), and all other settings are similar. Unable to figure out what is happening.

Any inputs would be welcome.


Thanks,
Sadhani