you have to open 5051-5052-5053
then you see image in remote with IE and active-x installed
with other browser i see cam only in localhost
I switch back to the default port but no luck. Furthermore, impossible to register the active X which is not signed. It is a real mess!
you have to change options of IE for trusted sites, adding the adress of the nvr and enable the installation of not signed active-x
otherwise you can download manually the active-x with a downloader and install it manually
then, if you opened the door 5051-5052-5053 it will work
trust me, i had the same problems and i solved like this
in case you need --> http://answers.microsoft.com/en-us/ie/forum/ie9-windows_7/how-do-i-add-a-site-to-my-trusted-sites-list/98cc77c8-b364-e011-8dfc-68b599b31bf5?auth=1