[2023] weird: Problems yet in launcher with login and update - but not if using VPN

Are you using Steam MP or Nakama (ie "cross store") MP? If the latter this is a sporadic problem with some users accessing the Nakama service; a VPN is one workaround.

Others are:

Disable IPv6
- Close CK3
- Go to Control Panel > View Network status and tasks > Change adapter settings (left side)
- Find your Hamachi Connection and Disable it
- Find your Internet connection adapter (for me, it was WiFi)
- Right click your internet adapter and select properties
- Scroll down to find "Internet Protocol Version 6 (TCP/IPv6) and uncheck the box
- Select Ok
- Start up CK3 and should work.

Disable all other network adapters
Go to Windows Control panel.
Click on Network & Internet.
Click on View Network Status.
Quick Tip: You can also quickly access these settings by right-clicking the network icon in the taskbar and selecting the Network & Internet settings option.
Click on Change adapter options.
Right-click all network adapters that are not connected to the internet and select the Disable option.


IF however you get this using Steam MP, probably some Steam ports are blocked:

Steam Support :: Required Ports for Steam

support.steampowered.com