I now know that my latest error "Failed to send HTTP request to NVR" is related to the Antivirus Virus software, First I found that HDDViwere was being blocked by the firewall, which also causes the "Conection failed message"; but even with the firewall shut down it is still giving me the "Failed to send HTTP request to NVR", this error only showed up on my clean test system after I installed BitDefender Total Security. Now to get to work and figure out what is being blocked even with the firewall disabled.
Bruce H.