Dahua NVR access problem from different ISP

[electroace]

Does anybody else have similar problem.
I have dahua NVR configured with 192.168.1.108. I can access to it from local network and I can access to it from internet, but Only if I am onto thesame ISP.
this happened after modem change.

in case of accessing thru dmss app, I get an error: connection failed (aftr long wait). dyndns works and updates IP regularly, IP adress of router is not behind CG-NAT, and ports are open. even DMZ is on.
current modem settings for port forwarding:

 

[bigredfish]

Most will tell you that you shouldn’t port forward, (I use open vpn) but when I do to allow someone temporary quick access for some reason, I only open 37777 and 80 fyi

Two things come to mind off top of head

- I recently changed my router and couldn’t get to work remote. Problem was old router (gateway) was 192.168.1.254 and new one was 192.168.1.1 (modem is in Bridge mode)

- you say new modem, is it possible new ISP restricts certain ports?

 

[ludshed]

That .254 vs .1 has caused some minor cussing over the years!

 

[bigredfish]

My own dumbness of all things networking. I know just enough to be dangerous