Random guesses

Reinstall everything (remove any leftover files before) Disable any security software Try a VPN from a different country Try the newest or random older client version https://github.com/FAForever/downlords-faf-client/releases Try a different client https://github.com/Eternal-ll/Ethereal-FAF-Client/releases/download/v0.5-beta-fixes/win-x64.rar