Article ID: 2679346 - View products that this article applies to.
Consider the following scenario:
Unable to get eligible principals: Operation failure
This issue occurs because of a time-out error that occurs when the Group Chat Administrator Tool performs a Lightweight Directory Access Protocol (LDAP) search in the Active Directory database within the distribution list. The time-out value for a search is 15 seconds.
To resolve this issue, install the following cumulative update:
2670342After the update is installed, the time-out value for searches is set to 120 seconds.
(http://support.microsoft.com/kb/2670342/ )Description of the cumulative update for Lync Server 2010, Group Chat: February 2012