Troubleshoot port forwarding. Could it be ISP blocking incoming connections?

Posted by Gravy on Server Fault See other posts from Server Fault or by Gravy
Published on 2012-11-29T01:17:30Z Indexed on 2012/11/29 5:07 UTC
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Had a new Axis IP camera delivered yesterday. Plugged into Cisco E2400 Wireless Router but having problems.

Example topology:

  • WAN IP: 10.10.10.10 (example)
  • Cisco Router: 192.168.1.1
  • Axis Camera: 192.168.1.10:80

Port forwarding rules set up on router

  • External Port: 999
  • Internal Port: 80
  • Protocol: TCP & UDP
  • Device IP: 192.168.1.10:80
  • Enabled: True

Trying to connect from within the lan to 192.168.1.1:80 from within browser - Works properly.

Trying to connect from within the lan to 10:10:10:10:999 from within browser - Works properly.

Trying to connect from outside the LAN (e.g. via 3g or another isp) to 10:10:10:10:999 from within browser - Doesnt work.

I get the following errors from different machines / browsers:

  • Safari could not open the page because the server stopped responding (IOS)
  • The server at xx.xx.xx.xx is taking too long to respond. (firefox)

This problem is not just for the Axis camera. I am also having similar problems connecting to my NAS drive.

After using a web based port scanning tool, it appears as though port 999 is closed. Not certain why when I have set up port forwarding within the router.

Any troubleshooting suggestions to help me determine whether the problem is with my Cisco settings / firewall or whether it could be my ISP blocking incoming connection requests?

Many thanks

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