Thursday, March 05, 2015

Lync - External meeting participants not able to use web join

I had this issue recently where a customer reported that external parties couldn't join a meeting. I asked him to send me a meeting, I clicked the URL, and I got right in. After a few emails back and forth, realized that the issue occurred if the external party didn't have Lync installed. So I forced web join using ?sl=1 and sure enough, I got a DNS error that the internal web services URL could not resolve.

Thankfully, this is a very simple fix, their external web services URL was reverse publishing from 443->443 when it should have been 443->4443.  I changed their TMG publishing rule and everything worked OK after that. 

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