I just can't get this to work:

Using Red Hat ES 4's VNC server at home, and trying to connect to it from work using RealVNC's client.

What port do I need to open in the firewall sitting in front of the Red Hat machine to allow VNC access to it?

I can see with a netstat -an that the Red Hat machine is listening on ports 5801 and 5901. I understand that 5901 would be the port to connect to for the :1 vnc session on the linux machine. Even so, the RealVNC client fails to connect.

Any help will be much appreciated. I've googled the issue, but with little success on a definitive answer.

Thanks.

5800 and 5900 are the normal ports for VNC AFAIK , especially 5900

do you use a router to manage your internet connections?
If yes, you'll have to create a virtual server there so
the router knows which computer to forward the connections
on port xxxx to

Thanks for your replies.

Yes I have a modem/router set up at home with a port forward set up for port 5901 to my Red Hat server.

5800 for when using a Java client via a browser, right?

5900 for using the normal client, right?

And then, e.g. 5901 for session :1 and 5902 for session :2, etc... right?

I've found a reference on the Internet saying that if you connect from Windows, using the RealVNC client, then you should use:

dns_name_of_server:5901:1

or

ip_address_of_server:5901:1

to connect to the VNC server on port 5901 (if it's listening on that port) and to session :1. Is that correct?

Thanks again.

vncviewer ip_address:1

Got it working.

Outbound VNC connections had been disabled on the firewall at work for some reason. Allowed outbound connections to port 5901 and all is fine.

For the record: I can actually connect with server:5901:1 and server:1 - both work but I haven't tried it for, for example, server:5901:2 to connect to another vnc session.

Thanks anyways for the help!