I am having the same problems. I cannot connect to
http://mamboforge.net/ 
The ping and tracert work fine.
But I get following error when i enter the URL
Error
InterScan HTTP Version 3.81-Build_1022 $Date: 12/19/2003 17:51:0017$
Connecting to mamboforge.net: Connection refused
I am connecting from Brussels, Belgium. Any ideas ????????
Regards,
Nagraj