Question Can't Play Games Online

Mar 5, 2020
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So i just finished building my first PC and installed Win 10 via USB Stick. I can surf the web and Play Games offline(AoE2, Payday2, Rainbow6, Overwatch) but i can't connect to any Servers..

It is not Just with Steam Games but also Uplay (Rainbow). I have tried uninstalling Avast and turning of Windows Firewall/ Zonealarm momentarily but that has helped nothing. I also tried scanning for Viruses multiple times but it says my System ist clean. I'm connected via LAN-cable and the Connection is running smooth at 50-100mb/s.
Do you have any further ideas that don't involve completely resetting my PC?
 
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