about 2 months ago - AndrewT - Direct link
What version of the Paradox client do you see? Current is 1.0-beta-75

Do make sure that all traffic to and from api.paradoxplaza.com and api.paradox-interactive.com is allowed through all your firewalls.  
about 2 months ago - AndrewT - Direct link
In Windows it's logged to a file cpatch.log in C:/users//AppData/Local/Paradox Interactive/launcher/ . I'm assuming from your sig that this case is on Linux though; if so I don't have the file location on Linux to hand but if you can find that file it might help.  
about 1 month ago - AndrewT - Direct link
Okay I ran up my Ubuntu VM installation. The client log file is .local/share/ParadoxInteractive/launcher/cpatch.log - I'm surprised a search for that filename did not find it!

There are other .log files in that folder too, may as well add the latest one here, thanks.