Couldn't login with VPN running today

Anyone else whom uses a VPN notice this? I’ve never had a problem logging into the forum with it running, but today it kept sending me to xboxlive.com to sign in, which also didn’t sign me in.

The only fix was disabling my VPN, but oddly enough, I’m still able to use the forum if I re-enable my VPN while logged in.

They need to fix this, especially since I only play the campaign, and while offline.