Tried multiple times today with no luck via Firefox. Tried Edge. Exact same result. Got on about an hour ago. Went to another site, then tried to go back and failed again. Had to try three or four times this time. Got in by going straight to the main board that shows the threads. Tried Internet Explorer. No luck.
Message from Firefox and Edge (I hate Edge) is as follows.
403 Forbidden
Request forbidden by administrative rules.