0% when Joining Game in Multiplayer

[lostthings]

"Documents\Paradox Interactive\Imperator" file deleted but it is not helping.
Integrity of the game checked, no problem there.
We have no mods, and we have the same version of the game and the check sum is the same.
We can find each other, but whoever that joins will stuck at 0% and then my friend was forced out of the lobby.

I've attached logs relating to multiplayer below

 

[AndrewT]

Those logs record the fact of the disconnection, but not why. Which IMO implies it comes from outside the game.

Is this happening with one particular existing game? Or if you try and start a new one too?

Can you play Stellaris , HOI4 and CK2 together okay?

 

[lostthings]

Those logs record the fact of the disconnection, but not why. Which IMO implies it comes from outside the game.

Is this happening with one particular existing game? Or if you try and start a new one too?

Can you play Stellaris , HOI4 and CK2 together okay?

It happens when we tried to start a new game.
Stellaris could work just fine. Haven't tried HOI4 and CK2 yet.
And we've been playing civ5 multiplayers for a while and it is fine, so I don't think it's the problem of the internet

 

[AndrewT]

Those games of ours I mentioned all use Steam MP services. I suspect that Civ5 does not.

You should make sure all players have opened (NOT forwarded) the required Steam ports in all their active firewalls (each player may have up to 3)

Steam Support :: Required Ports for Steam

support.steampowered.com