Out of Sync errors on Lan, 2 players, slow speed

[Nimnen]

Additional details with questions:

* 1 desktop with a wired connection
* 1 laptop with WiFi, great signal - would it help to have a wired connection?
* always playing on the slowest speed, no exceptions
* no issues with transferring files between computers, that always has good speeds with no interruptions, though it seems it's connecting us to a remote server rather than it being p2p
* external connection is usually great.
* we often alt-tab to search for stuff, but we play in Borderless Window mode. Could this impact things?
* once an out of sync error happens, are there problems with saving and starting over?

Thanks in advance for any ideas and suggestions. And thank you devs for an awesome game, I know network errors are the most annoying ones to fix

 

[AndrewT]

it seems it's connecting us to a remote server rather than it being p2p

That is correct, all MP play goes via the Steam servers.

Here is my standard MP checklist for this game:

- make sure all players have opened the required Steam ports in all their active firewalls (each player may have up to 3)
https://support.steampowered.com/kb_article.php?ref=8571-GLVN-8711

- all players delete their documents/paradox/ck2/gfx/ folders, and let the game recreate them
- use no mods at all
- all players use the same language in-game
- when anyone gets an OOS error, re-host the game immediately, as it will almost certainly crash soon
- start your multiplayer games and wait half a minute or so before unpausing without any player performing any action at all. Only after the game has been unpaused should players begin doing actions like setting up the council, declaring war etc.

Good luck!