About VNC "server cannot be found"

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http://forums.opensuse.org – Hello all. I am using OpenSUSE 11.2 with KDE 4.3.1. I would like to connect as a VNC client with KRDC to a VNC server (RealVNC) running on a Windows XP computer. I try to connect typing "<IP_adress>:5900" in KRDC but it does not work (message "Server cannot be found" is displayed). Same problem if I type "http://<IP_adress>:5800" in Firefox (3.5). The default ports (5800 for http and 5900 for TCP) seem to be correctly open on the server but perhaps the antivirus (free AVG) is not correctly configured and I do not know how to properly configure it... Pinging the VNC server IP adress does not work too... Has anyone an idea ? Thanks a lot. (Distributions)