Setting up a DVR - external IP problems

[silverbear7]

Hello, everyone.

I've just set up a standalone DVR, and while I can see it from any computer on the network, I'm having some trouble setting up remote access.

I can view the video fine from any computer on the network, but any attempt to connect to it from the outside (i.e. proxy/TOR) fails with a "timeout" error.

The first suggestion was "Your ISP may be blocking Port 80", so I set up the DVR's server to use port 8080. The router is configured to forward port 8080 to 192.168.1.220 (the DVR's IP). It's also configured to place 192.168.1.220 in the DMZ.

Result: no change.

Next step, DynDNS. Got it set up, specified DDNS settings in the DVR and the router... no change. Using domainname.dvrdng.org or domainname.dvrdng.org:8080 instead of 99.99.99.99 (my external IP) makes no difference.

What am I doing wrong?
Is there a setting I'm missing?
Please help... thanks!

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DVR Info:

Aposonic A-S1601R4
IP: 192.168.1.220
Subnet Mask: 255.255.255.0
Gateway: 192.168.1.1
DNS 1: 168.95.1.1
DNS 2: 168.95.192.1
Web Page Port: 8080
RTSP Port: 554
RTP Start Port: 1024
RTP End Port: 10000

Router Info:

Linksys WRT-54G
Port Forwarding:
80 > 192.168.1.220
8080 > 192.168.1.220
DMZ: Enabled
DMZ Host IP Address: 192.168.1.220