Have you tried swapping around who's hosting (you host instead of them, etc)?
Are you both using 2011M?
Are you both using any mods/expansions (Project Phoenix, Novetus+, etc)?
What's the version number of novetus for both of you?
Are you both using the same OS? If not, which ones?
Are you using a different port than what they hosted?
Thanks for the answer...
Still don't know, you can answer these if you want, but I don't know if I can help.
Have you tried swapping around who's hosting (you host instead of them, etc)?
What's the version number of novetus for both of you?
Are you both using the same OS? If not, which ones?
Are you entering a different port than what they hosted.