@joseph_1979

Thanks Joseph for taking the time to respond. I agree on the wifi comments and one camera is at the end of garden so that may need resolving.
However all the other cameras have good signal and no congestion. I also note your obvious comment on the NVR is for Reolink cameras. However i thought reolink devices including NVR will recognise or work with OVNIF so I don't understand why the IeE20 won't connect and the others do and you have offered no possible areas or suggestions as to what issues to look for . I keep getting failed to connect response.
You also did not comment on
However every time they disconnect the NVR channel data is lost. Is that normal?
or
I also notice that the NVR often loses the connection with PC client and android client especially if both connect at same time. Is this normal?
Thanks

Help.
I have set up RLN8-410 with 4 reolink cameras that appears to function ok.
However i am trying to also display the output from 4 other previously installed cameras. They are all fixed IP addresses and set with onvif enabled. Most of the older cameras , are set up on wifi with fixed IP on the same network.They display ok, albeit intermittently.
I suspect this is due to the wificonnection being lost. However every time they disconnect the NVR channel data is lost. Is that normal?
The Reolink RLC-511w i have also seems to work ok.
The big problem i have is with the IE20. Has anyone managed to get a geek IE20 camera with onvif turned on to actually display on a NVR 810 as everything I have tried fails to produce a display on the monitor. Using other 3rd party s/w vendors works fine so I know the camera is outputting correctly. RTSP and onvif are turned on and ports on both set to 8080.
I also notice that the NVR often loses the connection with PC client and android client especially if both connect at same time. Is this normal?
Wasted a few days now on all this already. I mistakenly thought using Reolink would be a good choice but it all seems so glitch. Any help advice appreciated.