Problems with remote desktop

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http://forums.opensuse.org – I am not sure where the problems lies, but I have been trying to use remote desktop (using KRDC) to work on my friends computer with Ubuntu 9.10 on it. I have everything set up right, but it is horribly inconsistent. I have set up port forwarding on her router, but though that helped at one time, it doesn't anymore. One minute I try to connect to her IP with port 5600, what we set up the first time which worked, and it keeps saying server not found. So I have her forward a different port, 5900, and when I go to connect I get the same error, but then I try port 5600 and all the sudden it works. BUT, the computer needed to be restarted and afterwards NEITHER WORK! Her IP is the same, I don't understand what the issue is. There is no reason for it to keep saying server not found. Any advice would be appreciated, I have limited access to their computer and remote desktop is the best way for me to fix any problems, I just need to get it to work consistently. (Distributions)