Hi!
I had the same issue. Updated the outdoor DS-KV6113-WPE1(C) and the indoor KH6320-WTE1 units and NVR (DS-7108NI-Q1 / M) cannot connect to the outdoor unit.
The solution in my case: I changed the outdoor unit resolution to 720p (save it), and back to 1080p. After that, NVR can connect and...