Hi,
So we have Lync 2010 working perfectly and 2013 side by side in the production environment but still in testing.
On first launch of the 2013 client, we get this prompt:
Entering some credentials or even cancelling seems to work sometimes and everything is fine after that, but we'd like this not to happen for every user on first launch if we can avoid it.
The person who started setting up Lync 2013 is no longer with us, I'm assuming its something in TMG that needs updating, but with all the Lync rules we have, I'm not sure what.