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Thursday, April 12, 2018

Exchange and Skype for Business error 14563: Two servers cannot be configured at the same FQDN with different server version numbers.

Event ID 14563
Source LS Protocol Stack

Two servers cannot be configured at the same FQDN with different server version numbers.

Cannot configure a server at FQDN [exchange.doamin.com] because another server is already configured there with a different server version number.
Cause: This is a configuration problem.
Resolution:
Review the server roles that are configured at this FQDN and ensure that they have identical version numbers.


Please review https://blogs.technet.microsoft.com/jenstr/2012/11/13/when-to-have-a-lync-trusted-application-pool-for-exchange-owa-im-integration/


It seems that you have trustedapplicationpool defined in Topology and also UM server is assigned for a dial plan.  This will push twice server name to Skype.

Remove from topology or if you have several servers, do it in the way that it is popolated without a conflict.


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