Unusual DVR remote viewing issue

I can view my 16 CH DVR remotely if I plug my PC in to my cable modem directly but when connected to my Dlink wireless router I get no video display. I can login to it but no video. I cannot find any reference to opening ports on the remote router. Any ideas? Any help would be appreciated.

[scorpion]

Scroll down to Dlink in the left hand column
You can use gadspot IP camera for the device if you are using AVTech DVRs.

http://www.portforward.com/english/r...outerindex.htm

[admin.chec]

if u have to enable activex controles in internet explorer then u will get