I have successfully deployed my Lync server and calls,screen sharing,etc all work internally.
I have the server sitting behind an ASA5505 firewall and calls from a VPN client to Internal user also connects without issue.
The issue is when a VPN client attempts to call another VPN client, I get "Network Connection Error" messages. I suspect it could be a port forwarding or NAT issue on my firewall but I would like to get feedback on this.
this should be the Firewall blocking the Higher port range that carry the RTP. Refer to below article regarding the ports that need to be opened
Thamara. MCTS, MCITP Ent Admin, Specialized in U.C Voice OCS 2007 R2
It looks lik the VPN device cause this issue. You can check if the VPN device has firewall and filter functions.
With my experience, using VPN for lync external user always cause exceptional mistake. If still can not work, the lync edge server is recommended to deploy.
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When one client opens a connection to another client it is peer to peer. The question comes down to can they route to each other? 100% taking no credit, here is a link that might pertain to your situation.
- Proposed as answer by Jay Brummett Thursday, January 12, 2012 11:26 AM