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Connecting Lync Client to Lync Server throw the Internet - Just one StandAlone LyncServer

Hello

I configured a StandAlone (Standard) Lync server 2013 inside my network and I can use the Lync clients internally without any issue, it Works very fine.

Now I want to connect the Lync clients from the Internet. I published my Lync server from the Internet opening ports TCP 443 and TCP 5061 in my router, but when I try to connect from the outside the Lync client returns a generic connection error

Additional information: My Lync server is using the Lync certificate from an internal CA that is trusted by the computers that I want to connect from the outside (It was added to the Trusted Root CA Authority" store in order to avoid certificates issues)

Any idea what is going on?
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Schnell Solutions
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Schnell Solutions
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Cliff GaliherCommented:
A Lync edge server is mandatory for that usage scenario. 5061 is only a primary communications channel. There are several secondary channels that are also opened that the edge server facilitates. This is all based on STUN/TURN industry standards so is not unique to Microsoft.
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Schnell SolutionsSystems Infrastructure EngineerAuthor Commented:
Hello,

The StandAlone Lync server includes an internal Edge component. Is it necessary and mandatory to use one additional server (two servers in total) just for publishing IM for few users?
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Cliff GaliherCommented:
For external users, yes.
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Schnell SolutionsSystems Infrastructure EngineerAuthor Commented:
Hello Cliff,

If I want to add an additional Edge server in order to convine it with the StandAlone Lync Server. Do I need to modify the Lync Topology again? Or just install a new server including that role?


In another hand, what is different that it connects internally in the network but not from the outside?

J@B
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Cliff GaliherCommented:
You will have to update your topology. And as far as the differences, it stems from the media channels that Lync uses and various NAT traversal mechanisms. Like I said, you can read about SIP, TURN, STUN, and ICE in various SIP forums. Asterisk, 3CX, and various other SIP based products use similar topology technologies for the same basic reasons.
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Schnell SolutionsSystems Infrastructure EngineerAuthor Commented:
Thanks Cliff
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Schnell SolutionsSystems Infrastructure EngineerAuthor Commented:
Lot of thanks
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