I am doing my own CCTV remote surveillance DIY. My Avtech AVC792 DVR has been working perfectly and accessible via LAN (both PC or Mobile).

But the problem is I cannot access it from WAN. My DVR is able to update the DDNS constantly, meaning to say I could access the dynamic IP using hostname from WAN. If I input my hostname into the browser, I will get the router login page, eg. mydvr.ddns.eagleeyes.tw

My router is Aztech DSL5008EN. I have perform port forwarding as below:

Public Port Range = 88-88
Private Port Range = 88-88
Local IP Address = <IP address of my dvr>
Protocol = Both

My DVR is configured to use port 88 which has been working when connected from LAN.

However, when I specify mydvr.ddns.eagleeyes.tw:88 in my browser or in eagleeyes, it fails!

It seems that the router didn't forward the port to my DVR correctly. I have enabled NAT as well in the router. Anything that I have left out? Any of you face similar issue before?

Thanks in advance.

Problem solved!