treid that ten his ip is all that reports. no user/pass
If you have his IP your almost there. Open Router menu and look for a page which allows IP blocking. Enter his IP address via this menu - save and that should block him. Without knowing your router model I can only guess it has this menu ( most modern routers/modems do ).
As long as you have set his Fline to 0 0 0 { 0:0:0 } he will in the end give up, however some peers are a pain in the ass and try for months!!!!
Don't forget the "thanks" button.