PLDT Home Baudtec RN243R4-2T2R-A6 Portforwarding Problem

I want to Portforward the ip of the CCTV DVR. I am using also dyndns account.

Is this the right Portforwarding steps?

Go to NAT, Virtual Server. Input ip address of the device.

Go DYDNS and input host name, user name and password.

I also inputed the correct settings in the DVR.

History, the DVR can be seen online for a month. Then it suddenly cannot be seen anymore.

I can see it using Local IP when I connect to the same internet.

Is it possible PLDT is blocking the port?

I am using port 8000 which is the DVR's default Port.

I check in canyouseeme.org still the port is close.

I tried changing the port to 8001 and 9000. still the same.

Please help.


Thanks!