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Lync Server 2010 DNS problem

Posted on 2011-03-23
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Last Modified: 2012-05-11
Hi All,

I have installed Microsoft Lync Server 2010 - standard edition. I have managed to get everything working except getting the clients to connect automatically. I have adding the SRV record correctly and the Host A record, I have checked that I can ping the FQDN of the standard edition server and have also done an nslookup and all bring back the correct results. I think I know what the issue is but don't know how to correct it so here it is...

My FQDN of my server is servername.zone.mydomain.ac.uk however when using the automatic config in the desktop client I get the following error in my event viewer:

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
Communicator was unable to locate the login server.  No DNS SRV records exist for domain mydomain.ac.uk, so Communicator was unable to login.
 
 Resolution:
 Please double-check the server name to make sure that it is typed correctly.  If it is correct, the network administrator will either need to use manual configuration to specify the login server's fully-qualified domain name (FQDN), or add DNS SRV records for the mydomain.ac.uk domain in order to allow automatic client configuration.  The DNS SRV records _sipinternaltls._tcp.mydomain.ac.uk, _sipinternal._tcp.mydomain.ac.uk and/or _sip._tls.mydomain.ac.uk may need to be configured if automatic configuration is desired.

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

As you can see the two domain names do not match...for some reason the client is trying to connect to mydomain.ac.uk instead of zone.mydomain.ac.uk. I assume I must have configured something incorrectly during installation, however I have checked and re-created the topology with the correct FQDN of the server and the FQDN of the SIP domain. Does anyone have any suggestions I can try to resolve this?

Thanks

Natalie
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Question by:brookesm
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8 Comments
 
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Expert Comment

by:madshjensen
ID: 35197573
Try adding sip.yourdomain.com pointing to your FE server.
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Author Comment

by:brookesm
ID: 35197624
What kind of DNS record? Host A?
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Expert Comment

by:madshjensen
ID: 35197645
Try it out as a Host A.
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Author Comment

by:brookesm
ID: 35197671
No that didn't work. Any other suggestions?
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Expert Comment

by:madshjensen
ID: 35197716
Did you log out/in of Windows afterwards? Try adding it as a cname then, but I'm not sure if it'll work. You're certain you've added the SRV records correctly, as described in your question?
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Expert Comment

by:madshjensen
ID: 35197726
Have a look at the requirements here:
http://technet.microsoft.com/en-us/library/gg398082.aspx
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Author Comment

by:brookesm
ID: 35198061
Hi,

Yes I have added the SRV and Host A records for my domain, however the error returned is not for the FQDN of hsfc.mydomain.ac.uk it is for mydomain.ac.uk so for some reason it is not using the FQDN and I don't know why!

Thanks
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Accepted Solution

by:
Jeff_Schertz earned 500 total points
ID: 35198602
What is the SIP domain that the client is signing-in with?

For example, if you are trying to sign in with "user1@mydomain.ac.uk" then Lync will automatically search for the SRV (and A fall-back) records in the "mydomain.ac.uk" domain.  you cannot use SRV and A records in the hsfc.mydomain.ac.uk domain in which the server's FQDN is (e.g. lyncfe.hsfc.mydomain.ac.uk).

You need to create the SRV record (_sipinternaltls._tcp.mydomain.ac.uk ) and associated A record (sip.mydomain.ac.uk) and ten make sure that the certificate on the Lync server has that A records included in it's SAN (sip.mydomain.ac.uk).

The configuration above is the only supported solution, you cannot point and SRV record in one domain to an A record in a different domain as the Lync client will fail to login.  So do not point _sipinternaltls._tcp.mydomain.ac.uk to the server's FQDN (e.g. lyncfe.hsfc.mydomain.ac.uk) since those are not in the same DNS forward lookup zone.

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