Bro can't run a co-op on his own PC.

[Panzerlang]

He can connect to mine with zero issues (very occasional boot to menu on first attempt) but now he's trying to run one for himself (from a PWCG mission) he is constantly booted back to menu. He's mirrored all my MP settings apart from using his own IP address (the default one as assigned by his game).

Any ideas appreciated, TIA.

Edited August 2, 2021 by Hetzer-JG51

[Cynic_Al]

This problem can arise when the map hasn't been updated in the mission editor to the latest version.  Is he sure that the mission type is correct?  I don't know what it should be for a co-operative mission.