Cannot Get Connection -- Could a firewall be blocking it?
hal "at" thresholddigital.com
Fri Feb 10 15:20:51 2006
I've asked this before, in variations, and never gotten a response. I always
wondered if it was just low traffic on the list or what. I figure this is a
good time to re-ask it, since with all the discussion over quoting styles,
there must be a lot of people reading the list now.
I have a client who cannot connect to me using RealVNC (both client & server
on Linux). B We've tried this from his office and his Father's office, nearby. B
I'm running vncviewer:
on my system, with my firewall set to forward port 5500 to my workstation, and
it forwards port 80 to port 5500 on my workstation as well (I leave these
ports closed unless I'm working with a client). B On his system he's running
vncserver and it is using display :1, so he uses this command line:
vncconfig -display :1 -connect myname.dyndns.org
And we don't get any connection. When I run the same line from inside my LAN,
so it connects by going through dyndns.org, it works. B When my friend does it
from his office, nothing happens and he gets no connection. B I figured his
firewall may be blocking outbound connections, so I had him try:
vncconfig -display :1 -connect myname.dyndns.org:80
to send the connection through port 80. B If he tries to read a web page on my
address, I see it on my firewall logs, but when he tries this (trying to
connect to my vncviewer), I see nothing in the firewall logs.
Is there any way to make the connection look like an HTTP connection (other
than using port 80)?
Can anyone guess what is likely happening? Is it likely his firewall is
blocking the outgoing signal because it realizes it isn't an HTTP connection?