I use Microsoft Lync for Mac for work.
Up until this week, it worked fine. No issues, very fast, etc. Since using it this week, it will log in, and then immediately log out again with an error that the service is unavailable.
However, if I switch my computer's connection to our Cox Communications line (we have two to the house), everything is fine. Literally no other change -- same firewall, same internal network, etc. The only difference is the routing to the internet -- I leave the other comptuers on Verizon, but route a work computer via Cox.
I can replicate this problem on multiple clients within the network -- so it's not the client. And, move the client outside the network (tether to my phone, for instance), and it works too.
The problem HAS to be Verizon then -- so what changed? And how do I get it fixed?