Hello Stephen,
Yes, I'm aware its a very common error. Have checked the following:
-- SMP Service is running
-- Network connectivity seems okay.
-- User name entered correctly
-- For port being incorrect, as we do not enter any port now while connecting I'm hoping it is trying to connect using the correct ports. Anyway to verify the port no and if it is blocked by the firewall?
-- Device has always connected to the dev servers and no chance of having any production application logic and nothing in the events.log file as well regarding this.
-- Wifi connections seems good and not dropping while connecting.
Regards,
Gourav