Lync cannot verify that the server is trusted


Problem
You get the error message “Lync cannot verify that the server is trusted for your sign-in address”



Cause
When Lync Communicator discovers the Lync FE to log on to it uses the SRV Record _sipinternaltls._tcp.SIPDOMAIN.com. If the associated server FQDN is resolved to a server that doesnt match the SIP DOMAIN then this error is presented.EG Below record is for DNS zone xxx.co.nz, Sip Domain is xxx.co.nz but target host is a .local FQDN


Solution
Add an A record (xxx.co.nz for the FE Server) with matches the Sip and DNS, then edit the SRV record to point to this record.
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About Paul B

My name is Paul Bloem and I am employed at Lexel Systems in New Zealand as a Principal Consultant for Unified Communications. I have been working on enterprise voice solutions for over 20 years. My first 10 years were spent working for a Telco in South Africa (Telcom SA). This is where all the groundwork happened as I was exposed to just about every aspect of telecommunication you could imagine. I develop an interest in PBX technologies and eventually became the go-to guy. Next, I had a 10 year run at Siemens South Africa, most of my time there was as a Technical Trainer. During this time VoIP hit the world stage, I had the privilege of introducing VoIP both as H.323 and later SIP across the Siemens HiPath 4000 solution stack. In 2008 I immigrated to New Zealand with my newly attained MCSE, I was ready to go where no PBX Techie had gone before. I was employed to explore OCS 2007 and that was pretty much the beginning of the end for me. I have been working on OCS and Lync ever since. My current role focuses exclusively on Lync and associated technologies.. That includes pre-sales, consulting, architecture and design, training and support. I even get to play in the development space from time to time - focus on play ;-) I was nominated as a Microsoft VTSP for Lync early in 2013 and also awarded Microsoft's MVP award for Lync in 2014.
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