Thanks for the extra info.
The cameras you see online in iVMS-4200 are the same camera but added twice, as you can see that both are the PTZ-N2404I-DE3 - once from your Hik-Connect account (the top one in your list, which is why it disappears when you sign out), and then again via IP address (the second in the list).
When you view a device via Hik-Connect, it has a 5-minute timeout, which I think also applied in iVMS-4200 when you sign in to Hik-Connect:
I want to live view constant from an android but after 5 min it times out, I'm sure this is new as in the past its ran constant but with random drop outs. But now there is actually a message you've viewed live for 5 mins and screen goes blank. Can it be turned off?
www.use-ip.co.uk
The second one in the list should be viewable without timing out, as this isn't added via Hik-Connect.
It needs to be added to a "group" in iVMS-4200 for the live view and playback to work (see post #26 above), but I'm not sure why that hasn't worked for you.
The IPC-374-PTZ is a different camera, which has not been added to iVMS-4200, but I'm assuming that you need to be able to see this too?
So, you need to tick DHCP, which will get SADP to fix the network settings so it can be found on your network, and then either add it to iVMS-4200 with these correct settings - it should have an IP address of 192.168.1.x - it will then appear as online in iVMS-4200 too (see post #32).
If you still can't view the cameras listed as connected by IP/Domain, then you may have to use Internet Explorer to view them by entering the IP address in the address bar.
But, I think being logged in to your Hik-Connect account is confusing things, as it just means that the same camera is added twice.
Could you send a screenshot of the "group" page in iVMS-4200 too, please?