I am experiencing similar problems. Purchased a DVR 4CH H264 LE DVR.
Have setup remote viewing via dyndns and could access the DVR remotely on day one.
The problem I have is it works the one day then the next I get various errors as below(I make no changes to the remote PC settings, router or DVR, but get these errors and then am unable to logon).
Error messages:
Message: Object doesn't support this property or method
Line: 352
Char: 2
Code: 0
URI: http://41.145.197.160/
Message: Object doesn't support this property or method
Line: 1
Char: 1
Code: 0
URI: http://41.145.197.160/
and
Message: 'ocx' is undefined
Line: 352
Char: 2
Code: 0
URI: http://41.145.197.160/
Message: Object doesn't support this property or method
Line: 1
Char: 1
Code: 0
URI: http://41.145.197.160/
Active X controls all enabled.