Compass 1.29.5 all of a sudden refuses connection

Robo3t and all my applications still connect fine to my Atlas Collections but Compass just will not connect no matter what I try. I get
every single time. And I have connected this version of Compass to my collections dozens of times and did not change the connection string.

SOLVED - Seemed to be an issue with PortMaster which I had just installed. Uninstalled it and connection works fine again.