the problem dates back from early EAP release of Maia.
Possibly due to an update of TC to 4.5.5.
Since then, most project can't connect to the server and display the attached message.
But I still have one project that can connect without problems!!!
This is where the weirdness kicks in.
I can't find any possible reason to that.
Let me know if the post should go to Intellij forum. Seems to be TC plugin related.