Did you just change a setting to block incoming traffic using VPN's? I used to have no issue accessing the site from my home computer and now suddenly I get a "you don't have permission to access this site" error when I try to connect.
I maintain a VPN connection 99% of the time on my home computer.. Will be rather inconvenient if I have to disconnect and reroute my internet traffic just to connect to a forum.
If you're worried about troll accounts ect I know there's setting to limit how many posts you have before you can use a VPN. Shroomery has a 50 post count limit before VPN use is allowed. ... but then again by then you're user ID has already been mapped to a physical address so defeats the point.