Monday, February 17, 2014

Certificate error in Exchange 2010 integrated with Lync Server

Problem
1. Incoming calls suddenly started to fail
2. Outgoing calls still worked

When looking in the event log on the Exchange server i see: "A TLS failure occurred because the target name specified in the certificate isn't correct." (then the name is an empty string "")
Event 1021

When restarting the UM service I see another warning message, "The UM IP gateway or host "10.10.10.99" resolves to an invalid FQDN. Please check your UM IP gateway and DNS server configuration.

Solution
The second warning message is much more indicative of the problem. It can't find the hostname based on the IP Address. So i add it to the hosts file, restarted the UM service, and it worked.

Note: Updating the DNS would also work.

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