It would help if you could outline what errormessages you get, but I'm guessing the problem is due to firewalling. Are you running iptables on your host or have a firewall between the host and the internet? If so you need to open certain ports for the programs to come out. Google for filesharing and firewalls and you'll find a plethora of websites describing which ports to open and why.
If this doesn't help it, please post back with more details on the errors you're getting for us to be able to help.
-Y1
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