Cannot consistently view security cameras through software provided. Firewall seems to be the issue?
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.
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.
ASKER
Thanks JS but I am already forwarding ports 8234-8239 to the unit through the firewall. The problem is not that the packets don't get forwarded. The problem is that the packets are detected as a TCP NULL SCAN on the return trip by our Sonicwall.
The problem doesn't occur if you use a dialup connection and some routers such as my netgear wireless router have no issues either.
The problem doesn't occur if you use a dialup connection and some routers such as my netgear wireless router have no issues either.
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ASKER
Doesn't really solve the problem, but chances are that no one will have an answer.
http://portforward.com/routers.htm