Re: Can't connect to vncserver on dial-up...

Mr. Wang
Thu Jul 10 09:51:01 2003

Hello, Barry Zubel:

    Some details show as follows:
   My office LAN is directly connected to the Internet, no NAT, no firewall. My office computer is assigned a Global IP address. And let me state my experiment again:

Computer Infomation:
   PC1: vncserver, win2000 pro, network card connect to LAN1 and then to Internet.
   PC2: vncviewer, win98, network card connect to the same LAN1 and then to Internet/dial-up to Internet.
   PC3: vncviewer, win2000, network card connect to LAN2 and proxy to Internet.
   The Winvnc version is 3.3.7.

Experiment step:
   1. PC2 can connect to PC1 in LAN, 
   2. PC2 can't connect to PC1 Via dial-up network, PC2 can ping PC1 successfully, and can ftp to PC1, access sharing resource of PC1.
   3. PC3 can connect to PC1 over Internet.

so, It seems that Winvnc doesn't work on dail-up network. why?
Thanks for any help you may provide 

Best regards

> This is not true.  VNC does not care whether it is on a LAN, a dial-up
> network, or any other tcp-ip based communication system.  VNC *will*
> work if there is any TCP-IP connection to the remote machine. If you
> cannot 'telnet' to the remote port, then it is more indicative that
> there is no specified route to that machine from the point that you were
> dialling up from.
> What we need are more details.  Is your 'office' machine directly
> connected to the Internet, or is it behind a NAT router?  Can you 'ping'
> your office machine IP address when you are dialed up remotely? Is your
> remote 'Friend' accessing that machine across the Internet, or a company
> WAN?
> Please try to give as much information as you can to ensure that you
> will be given an accuate response. 
> Barry Zubel
> Able Packaging Designs Ltd
> -----Original Message-----
> From: [] On
> Behalf Of Mr. Wang
> Sent: 10 July 2003 05:04
> To:
> Subject: Can't connect to vncserver on dial-up network!
> first, thanks for Scott C. Best's reply. I have asked for some help
> before.
> Yesterday I made a test in my office,  The vncserver is still my office
> pc (win2000 pro), and the viewer is another pc(win98) in my office. 
> Firstly, the viewer pc connect to the LAN via network card, the
> vncviewer can easily connect to the server. 
> Secondly, I dial-up the viewer pc to the public Internet, it can't
> connect to the server,  neither telnet to the server 5900 port. I check
> my dial-up connection property----"banding TCP/IP protocol". Thirdly, I
> asked my friend who is in another city connecting to my vncserver. He
> did successfully, and his computer(Win2000) connect to the LAN via
> network card. 
> so draw a conclusion!*!*Winvnc can't be used on dial-up network!? why?
> it's not true in the vnc document. Who can explain that for me? 
> Thanks in advance. _______________________________________________
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