asked on

Event ID 680 LCS 2005

I'm running LCS 2005 on Windwow 2003 SP2. I have a user that is unable to logon. In my Security log, I'm seeing Event ID 680.

Logon attempt by:      MICROSOFT_AUTHENTICATION_PACKAGE_V1_0
Logon account:      xxxxxxxxx
Source Workstation:      xxxxxxxxx
Error Code:      0xC0000064

The client receives the error "Cannot sign in to Communications Service. You may have entered your sign-in name, username, or password incorrectly, or the authentication service may be incompatible with this version of the program..."

Thanks,
JJ

gaanthony

Are you able to sign on to Communicator with another user id on the problem user's machine? Is the problem user able to signon to Communicator from another machine?
Reason I ask is to rule out whether problem is with user's machine or their account.
Check whether there has been any OS hardening applied on the LCS servers.Run GPEDIT.MSC on LCS server and navigate to Computer configuration/Windows Settings/Security Settings/Local Policies/User Rights - Access this computer from the network and verify that Everyone, Administrators, Users, and Backup Operators are listed.
While in GPEDIT navigate down to Local Policies/Security Options - Network Security: LAN Manager authentication Level. Check this on Domain Controller, LCS Server and Workstation. If there's a mismatch it can cause NTLM authentication failure.

ASKER CERTIFIED SOLUTION

Jamie McKillop

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial