Ah, actually that makes a lot of sense. I have environment variables set (P4PORT, P4CLIENT, etc), I’ll play around with that to see what works.
EDIT:
Removing the environment variables didn’t help, and the fields were still prefilled with (wrong) server information. Seems that it’s remembering the last good connection it had, which is to a server that doesn’t actually exist anymore.
EDIT 2:
According to cancel’s comment below it might be that SSL is broken with 4.10