I hope this is the right sub for this kind of problem. I am at my wit's end. Two days ago, all my gaming clients (Battlenet, GOG Galaxy and uplay) stopped working i.e. I am no longer able to log into them. This already happened back at the beginning of January and I was told by my ISP to exchange the modem which I did. With the new one it worked until two days ago. I realized it did no longer work when I tried to play Dark Souls 3 online.

– I am under Windows 10

– I have a ConnectBox Router from UPC (my ISP)

– I have all the corresponding ports opened on the router

– I have everything in the Windows firewall settings set to allow said ports; I even totally deactivated the windows firewall AND the router firewall – still every port I check is displayed as filtered.

Strangely enough, the tool from portforward.com displays all of them as open. Yet all the clients cannot connect to the internet (which wouldn't be that big of a problem, but apparently, it affects steam games like the mentioned Dark Souls 3 as well). Apart from those clients, internet is working fine for everything else (Firefox, Discord etc.)

Has anyone ever experienced anything similar to this?

EDIT: Thank you all for your patience and efforts to help me! To conclude this post and provide information for others who might have the same issue: I was NOT able to resolve the problem in any way and had to reset Windows 10, after which everything was fine again. Seeing as the resetting process was no big deal, I'd consider this quite the solution.