I have a client with a Dedicated Micros DS1 video camera unit. In conjunction with DM network viewer software (http://www.dedicatedmicros.com/australia/support_downloads_online.php
) I am able to view the security camera's in some circumstances.
The camera unit has been setup behind two different firewall units. A sonicwall TZ190 running enhanced firmware. A linksys WAG54G v3 wireless access point. Both running the latest firmware.
The camera server uses tcp and udp ports 8234 and 8235.
The problem is on the return to the person using the viewer software. Depending on the connection type the camera's can be viewed.
If I use a dialup connection the video streams successfully.
If I attempt to view from behind our sonicwall TZ170 standard at work it fails. The logs reveal the packets are dropped due to a Probable TCP NULL scan.
Various other combinations work or not. A 3G internet connection via a PCMCIA card works. While a motorola cable modem will fail.
I have tried creating an ANY rule on the firewall between the 2 addresses to no avail. I have played around with MTU setting and allowing packet fragmentation. No result.
Any help would be appreciated.