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Cisco ASA cannot authenticate VPN clients using Kerberos

Posted on 2009-06-29
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Last Modified: 2013-12-04
The ASA was original pointing to a Windows 2000 server for VPN authentication. The Winows 2000 server was retired and we are now running a Windows 2003 domain. The authentication server address was changed to point a different domain controller. No other changes were made. Now the logon box re-appears after users try to connect using the Cisco VPN client.
A sample from the ASA log is below
5|Jun 29 2009|09:39:44|713904|||IP = 141.158.***.***, Received encrypted packet with no matching SA, dropping
4|Jun 29 2009|09:39:44|713903|||Group = *********, Username = *******, IP = 141.158.***.***, Error: Unable to remove PeerTblEntry
3|Jun 29 2009|09:39:44|713902|||Group = *********, Username = *********, IP = 141.158.***.***7, Removing peer from peer table failed, no match!
3|Jun 29 2009|09:39:44|713048|||Group = *********, Username = *********, IP = 141.158.***.***, Error processing payload: Payload ID: 14

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Question by:John_R_E
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Solution found. While authenticating to the Windows 2000 domain controller the Kerberos realm of NIXON was fine. When domain was upgraded to a Windows 2003 domain the full qualified domain name of NIXON.COM was required for the KERBEROS Realm
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