Using VPN connecting to Lync is just spinning and unable to connect.
With Lync 14.0.10 and before, the Lync client would go through a few different servers to connect and failing before being able to connect to the external server. For each "internal" server it would then fail with:
InternalConnect, NLCreateConnection returned: -3264,
With Lync 14.0.11, instead of going down the list of servers it instead keeps on trying to go to the same internal server .