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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