VNC Issues connecting through Internet

Olympus Vn-6200pc digital voice recorder
May 30, 2010 at 11:52:21
Specs: Windows XP
So I am having an issue with connecting to a specific workstation running RealVNC (also tried UltraVNC). I have created the pinholes (port forwarding) for this computer and another computer that I will be remoting into. The first computer on port A is working fine. The other one (on Port B) is not. It refuses the connection. The workstation will accept connections from computers on the local network, but not on the external network. I have allowed connections from 0.0.0.0/0.0.0.0.and still not working. I have checked for Firewalls and any other applications I can think of that would block the connection. I have uninstall/reinstalled several times. I have even created a new user account and tried a different profile. I believe I have covered all my bases, but still am baffled as what is causing this issue. Anyone out there that can point me in a new direction?

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#1
May 30, 2010 at 12:28:43
You have to check, whether you can access each PC via VNC locally in the first place.
If this is working perfectly, you only have to configure different ports in VNC to listen on.
Then in the router, you have to forward the appropiate port to the local ip address of that PC.
E.g.
forward 5900 to 192.168.1.100
forward 6900 to 192.168.1.101

Should work.

The original poster should always write the last response !!!
Let us know, if the problem is solved !!!


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#2
May 30, 2010 at 12:34:29
I appreciate your post, however, as I stated in the original post, I CAN connect internally. In the router I have forwarded two ports. One for one computer and one for another. One of them works and the other doesn't I have tried multiple combinations of them and it continually will work on one but not the other. I am convinced through all my troubleshooting that it is an issue with the computer. BTW while uninstalling/reinstalling I also deleted the Registry key for VNC and deleted the folder before I reinstalled. After I changed it from REALVNC to ULTRAVNC, I was still able to connect internally, but still not able to connect from the internet.

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#3
May 30, 2010 at 12:47:20
Can the problem computer access all internet sites?? (Default route) ??

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Related Solutions

#4
May 30, 2010 at 12:50:14
Yes, target computer is on the internet and working fine. It is able to browse websites, upload files to an FTP, get emails, etc.

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#5
May 30, 2010 at 13:06:36
Can you test the port forward to make sure it's working??
You can do it with telnet: telnet <hostname> <port number> like:
telnet example.com 5901

It should say 'RGB <numbers>' if it's able to connect...or a connect error message


Are you at all familar w/ running a packet capture?? Might be helpful to tell you where the problem is at...

I would
-Install wireshark on the problem computer
-Start the sniffer
-Try to connect from outside
-Stop the sniffer, look for traffic on that port number

If no traffic, it has to be the router/port forward. If you see SYN's but no SYN/ACK's, then it's probably the computer. And if you see both then...it should be working...? heh

http://www.wireshark.org/


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#6
May 30, 2010 at 13:36:10
You may also use an online port scanner to check, whether the port forwarding is really working, so that the port will be shown as open.

The original poster should always write the last response !!!
Let us know, if the problem is solved !!!


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#7
May 31, 2010 at 07:09:31
Thank so much for the suggestions. Port Scanning is one are that I am not to fluent in. This will be a good introduction.

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#8
May 31, 2010 at 09:04:36
At ShiledsUp!, you can do a port scan and give the port, you'd like to scan.
https://www.grc.com/x/ne.dll?bh0bkyd2

The original poster should always write the last response !!!
Let us know, if the problem is solved !!!


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