Whenever I connect Lync using Internet instead of LAN, Lync gives the error that it can't sync with the corporate address book. First thing I thought was that the external address book URL was not reachable, but this wasn't the case.
Checking Lync configuration Information (CTRL right-click on Lync icon in system tray and selecting Configuration Information) I checked both internal and external ABS URL's were there and were correct, this was the case. However under GAL Status the internal ABS URL was displayed instead of the external URL which I was expecting because Inside User Status was FALSE.
It looks like Lync is trying the internal URL instead of the external internet URL. I will verify this with Wireshark later on.
What can I do to fix this? Is there a way to test the ABS URL from the browser like with OCS 2007? If i go to the URL specified in the configuration (https://pool.domain.com/abs/handler), I get an access denied. This happens with both the internal and external URL.