Problems setting up a VNC connection from uni to home (SMC
Fri Sep 26 15:08:00 2003
Nim Sivakumaran said:
> Using the SMC setup menu through IE6, I have done the port forwarding
> through SMC's Virtual Server section, however from the posts I've seen
> here mine doesn't make any mention of a service port, instead there are
> about 5 columns, the first being the IP address of the machine behind
> the Lan whose ports I want to forward (my desktop), then the private
> port I want to forward, the public port and whether its is a TCP or UDP
> connection and a box to tick if I want the set up to be enabled.
> So I have 2 entries: Private IP: 192.168.2.22 for both, Private port
> 5900 & 5800, Public Port 5900 & 5800, TCP checked on both, and both
> enabled. I thought maybe I messed this bit up but I called SMC and the
> technical support guy verified that it was correct.
> Then I thought I may have got the wan IP wrong so called up Telewest to
> check if their IP address they had for my house was correct which it was
> and it was so I'm stumped now.
You can verify both of these by going to http://www.gotomyvnc.com/. The
button will give you your IP address, and the actual check will verify it
can connect to the commonly used VNC ports.
> When connecting from Uni I have used just the wan IP address (x.x.x.x)
> the wan IP with the port I want to connect to (tried both x.x.x.x:5800
> and x.x.x.x:5900).
> Every time I get the Connection time out error.
> I've got it to successfully work within the LAN, but can't seem to get
> it to work from uni so I'm not sure if it is a problem at UNI or a
> router problem. I was wondering whether I can connect to the desktop
> from another computer on the LAN to the desktop by going out and back in
> (e.g. by using the wan IP) but I'm not sure how to do it cos I'm not
> sure what additional ports to forward
Without knowing what the UNI network is like, troubleshooting is almost
impossible. Can you ping your WAN IP address? If not they are most
likely using an HTTP proxy (very likely in a UNI setting). VNC's RFB
communication will not work through an HTTP proxy.
> Oh yeah- the laptop I'm trying to connect to the desktop runs XP pro,
> and the desktop has XP home edition (Service pack 1 on both machines as
> well), and both have Zone Alarm Pro 3.7.159 running, but zone alarm on
> both allows VNC to connect I assume seeing as I can connect on the LAN.
I wouldn't be surprised if Zone Alarm treats WAN traffic different than
LAN traffic (that is the function of a firewall). With the addition of
your SMC, though, I'm not sure if Zone Alarm would make the distinction.
If Zone Alarm is stopping it, there should be a log record of it. You
could also try shutting off Zone Alarm and testing again.