over 2 years ago - AndrewT - Direct link
I've seen a few reports of this but have no solid reason for it yet, sorry. Do check all your firewalls allow eu4.exe through!  
over 2 years ago - AndrewT - Direct link
This Issue from 2 months ago has now disappeared so it is likely your friend has an unrelated problem.  
over 2 years ago - AndrewT - Direct link
MisterKrisobg said: I still have this problem.
Did you check your firewalls, as I suggested?

Is the problem logging into your Paradox account in the launcher within the game, or both?

This is just you having this issue, your friend does not? FYI my Epic edition of the game gets into MP just fine.  
over 2 years ago - AndrewT - Direct link
MisterKrisobg said: I checked my windows firewall and made sure that EU4 was allowed through to private networks
Has to be allowed in Private AND Public.

MisterKrisobg said: I asked my friend what his issue was again and he said that he can't load into the main menu (stuck in the loading screen).
So a completely different problem. Probably best they make their own thread here, thanks.  
over 2 years ago - AndrewT - Direct link
Sorry, sometimes it works? That I have no explanation for ...

Can you log into our launcher when run from HOI4 in Steam, which I see you own?  
about 2 years ago - AndrewT - Direct link
Still smells of something blocking eu4.exe from our servers then. Can you try connecting this computer via a VPN, or even a mobile phone hotspot, and see if you get the same issue?  
almost 2 years ago - AndrewT - Direct link
Clearly there is a firewall somewhere blocking the login. It can be in Windows, your internet router/modem, or your ISP.

Tracking down which one is tricky! If your ISP provided your modem/router, you can get them to check into both.