ever thought that maybe ur trying to send a file that thye server is blocking??? ...... i know its a stretch but hey i dont know what else to say if u can dcc in one network but not another ..... the only logical solution is the server is blocking u in some way ........ also if your pc is only resolving an ip to a local port on ur machine to send thru then uve got a dns issue ...... how are u set to resolve stuff thru???? another possible scenario ..... i dont have a right on target for ur question but those are the best suggestions or ideas i can think of