Problem with opening/port forwarding some ports but not others

I read the Faq and the first few pages of the forums but couldnt find anything.
I am using the Port Forwarding (WRT54G, Firmware 4.20.7) to my network camera to try to open up ports 80, 554, 5556 and 5558.
Using the network toolbox at Blackcode.com I then check the ports to see if they are open.
Port 554 seems to be open. Port 80, 5556 and 5558 do not appear to be open.
I am using the correct external IP address (I can toggle port 554 open and closed and test that). Toggling Blocking Anon Internet Requests Of/Off makes no difference to the result.
I have checked with my ISP and they dont claim to block those ports.
Any thoughts on what this could be? Is there a way to test if its my ISP? If it is my ISP, is there a workaround?
Thanks for any help.

Are you sure the camera does listen on those port at the time you did this tests? Are those ports open inside your LAN, too?
5556 and 5558 look like RTP ports which may only be active after the channels have been established through RTSP.
Forwarding of port 80 is known to be an issue on various routers as the router allocates port 80 for the web interface. Sometimes it helps to change the remote management port on the router from 80 to 8080 or something else. You may even have to enable remote management to get this active.
If this does not work you have to reconfigure port 80 on your server to a different port if possible.
Message Edited by gv on 08-21-2007 12:28 AM

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Lync Tips Blog - [email protected] - If this post has been useful please click the green arrow to the left or click 'Propose as answer'

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