1999 Honda Civic tie rod end stop nut stuck

I take it you are reffering to the nut on the "Inner Tie Rod"? It butts up against the outer tie rod end?You will more than likely have to heat it up w/a torch. If you do not have access to a torch, sometimes you can get it hot enough w/Butane torch to break it loose. It will take longer w/Butane, get it good & hot. Use caution not to burn any rubber bushings or axle boots ! Good Luck ! P.S, also use penitrating oil. P.B. Blaster or equivelent .