First thing I always check is if both clients got updated. However, you're right - most of the time connection issues happen right after an update rolls out - even if both PCs got updated, and even rebooted after that.
I can imagine that the server somehow still thinks that one of the clients still has an older version, even if that's not the case anymore. It seems to go away after some time (again, I suspect after the server gets updated information on the client version).
Roman K
First thing I always check is if both clients got updated. However, you're right - most of the time connection issues happen right after an update rolls out - even if both PCs got updated, and even rebooted after that.
I can imagine that the server somehow still thinks that one of the clients still has an older version, even if that's not the case anymore. It seems to go away after some time (again, I suspect after the server gets updated information on the client version).