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Microsoft Lync 2010 Federation not working

Posted on 2011-05-05
Medium Priority
Last Modified: 2012-05-11
Hi all,

I am in the process of migrating from OCS 2007 R2 to Lync 2010. All has gone well so far and i have a new internal pool and a new Edge server.

I can get remote access from my laptop from externally now but federation does not seem to work at all. I have a new cert from Trustico and it passes all tests on www.testocsconnectivity.com. I am not using Reverse Proxy yet as i dont need publishing at this stage.

I have the following DNS entries in place in public:




_sipfederationtls._tcp.mydomain.ie -> sip.mydomain.ie

Each of the dns entries above have an individual public IP address and are NATted to an internal address in DMZ.

I have also changed settings in the Federated route to point to the Lync Edge server

Users are set up for federation and confirmed user has: Allow Federation+Public+Outside Access

any ideas what i can try next please? weird that outside access works but not federation?


Question by:ericdaly
  • 2

Accepted Solution

ericdaly earned 0 total points
ID: 35704689

after much trying, it didnt like our internal DNS or public DNS but when changed to it works fine. Weird...

Author Closing Comment

ID: 35704692
found solution after hours of trying...

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