@Enzedder
Except according to his tracker page he's well below the limit, as well as being a power user. (though seeding 171 torrents seems a bit excessive...)
Besides if the error would have mentioned 'slots limited' I'd think he would have mentioned it in the OP...
Why I posted the above suggestions is because a general tracker error, 'access denied', is usually associated with a permission issue on systems rather than being a network issue...