AVtech 760 Remote Network Viewing.??

[Spreng 0]

Hi..

 

I've recently taken over a premisis..

 

I have a broadband connection with a router..and the AVTech 760 plugged in and configured...

 

I can run the Video Server E on a local PC.. and no problems.

 

The default port is port 80 on this device... but this is already taken up by the belkin router... so using port 81 or something... virtual server port forarding on the router to internal port 80 should and does work fine for every thing i have ever used...... except this.

 

It will not connect.

Is there additional ports it requires for connection authentication?

 

Which ports do i open?

 

Thanks in advance....

[Kiwi 0]

No doubt the most common question ever asked here...

 

In the DVR network settings did you correctly set the gateway and netmask?

 

All I have is TCP from internal 80 to external 8080 and it works fine.

 

You could try DMZ on the DVR, but set the DVR port (in the DVR) to other than 80.

[epipe 0]

Is there additional ports it requires for connection authentication?

After spending numerous hours looking at network capture output of traffic between Video Server E and AV TECH DVR I am quite confident to say that the software does not initiate nor need connections to any other port.

 

If I had a similar problem, I would do a packet capture using a tool like Wireshark to see what goes wrong. It requires some level of understanding of networking protocols.

 

If your port-forwarding firewall does anything else to the relevant IP packets than just re-forwards them as they are, it is possible that the packets arrive to the DVR in a format which it does not understand. AV TECH's TCP implementation is extremely buggy and will fail miserably for example if an HTTTP request does not arrive contained within a single TCP packet (but gets instead fragmented to two packets). Also the protocol is a mixture of HTTTP and odd kludges which means that if your firewall is trying to validate that you are passing proper HTTTP data, it will fail miserably also.

 

Please note that I am writing HTTTP with three T's on purpose because this board's stupid spam filter thinks I am a spammer otherwise (ouch...). (A couple of my previous posts remained unposted because I didn't figure this out and didn't bother fighting with the stupid spam filter.)