I have exactly the same issue with Sentient DVR CCTV Model N63HH - it works fine on the internal LAN but when trying to access over the internet - it says the password is incorrect. I have tried opening all ports on my router from 1 to 9999 both inward and outward and still no joy but as soon as I try over the internal LAN the system access works fine so if anyone has the answer to this I would appreciate an email to kgriff@ msn.com (without the space).
Kind regards...
Ken Griffiths