Problem wiht transfer port 3391 on 3389 RDP

i have test server(RDP) and i want transfer him on non standart port 3391 on TMG 2010

1. In registry RDP-tcp i changed portnumber 3389 on 3391 
2. In TMG i  access new rule non web publishing rule 
3. then i try join RDS(static adress *****:3391) on computer(not in local this server)he did not work=(
4. Where is problem? i need tips and sorry for my english :)