First thing I check anymore is that someone (or some other software install) didn’t install a server using the same TCP ports as Ignition. Once had an IT vendor install IIS role for quickie testing on a server that knocked Ignition out of the game. Was difficult at first to detect what was going on as Ignition’s web server and IIS battled it out for access to the port and got errors similar to those you are reporting. Just a thought…