I've been getting the "Connection to the server could not be established" error when trying to access the repositories to download mods. The error shows up on all three tabs. It was on a fresh install with the firewall turned off, and the online features turned on. Verify integrity didn't result in any errors, mods donwloaded manually worked, and the error persisted regardless of how the game was launched(via steam, via the .exe with steam opened and closed), so I have no idea what's causing it. The support ID is 74742.