@Haha 

Ofcourse if internet is restricted I can't view them remotely. I use Blue Iris for my NVR and handle remote viewing through that.

I activated and added the cameras to the Windows app while able to connect to the internet (on the same network). I changed IP addresses to the restricted area and the cameras remained in the Windows app and I was able to modify their settings. After 24 hours they disappeared from the Windows app. Discovery shows the cameras and the correct IP addresses. If I click on Add it fails because they aren't connected to the internet. I am still on the same network, not trying to do anything remotely except admin the cameras from the same network.

For me to admin these cameras I either have to remove the firewall rules and then add them to the Windows app again or change IP addresses to a different range with internet access. 

If these cameras can't talk to the cloud then you can't carry out basic admin duties on the cameras, such as renaming them, changing OSD, changing streaming rates. 

Also, the VIGI Windows app constantly crashes. 

@Haha 

Cameras and the client computer are on the same subnet. Direct communication is fine. VIGI App version 1.0.11

This is a corporate environment. I am a technician. This post is to warn others that may be thinking of deploying these cameras in a similar environment that they can't admin these cameras without giving them internet access, not to seek "help". Also to highlight the issue hoping that TP-Link do something about it.