After having AC run flawlessly for 2 years at reception, they now receive "Could not connect to server" or whatever when starting the application. To my knowledge, there has been no change to the AC services or the receptionists' phones & PCs. I also have AC installed at my PC for testing and I get the same thing.
I am looking for help troubleshooting this. I see no problems with services on the servers and nothing entered in event logs that would help diagnose. It almost seems like a port is being blocked but they claim no change to firewalls or PC rules.
Any advice where to start?