Need help regarding PTCL modem remote access and DVR viewing

Dear All, I have two problems for which any help will be highly appreciated.

1- I have a static ip configured on my modem, when i try to access my modem from a remote network the login page for the modem opens but upon entering the username and password the login page reloads again with no prompts of any sorts.

2- In the NAT setting i have forwarded the repective ports of the DVR to its private ip address from the modem, i am successfull in logging in to my DVR from a remote location but i cannot view the video feed when i press play. (Note: I can log in to the DVR and view the video feed when i am directly connected to the modem).

Thanks