By default VFBA uses port 28774 and TCP to communicate with EM and the Server from the Spare NVR. Rules need to be configured for outbound and inbound firewall rules on the SPARE server for failback to work as expected.
To check the settings Open up Windows Defender Firewall with Advanced Security and click on Inbound Rules on the SPARE server.
Look for a rule allowing communication on port 28774, if you do not see this in the list, then click on New Rule in the upper right hand corner in the Actions section.
Select Port and click on Next.
Select Port 28774.
Click on Next and Select Allow the connection.
Make sure all three boxes are checked.
Click on Next.
In the Name box type a name for this rule. I.E.- VFBA or evFailover, and click Finish.
Repeat this action for Outbound Rules on port 28774. It is neccessary to have both INBOUND and OUTBOUND rules configured on port 28774 on the SPARE server.
After configuring the inbound and outbound rules you can check the status by doing the following:
Open up task manager and click on the Performance Tab>Open Resource Monitor
Look at the Network Tab and under Listening Ports, verify it says Allowed and Not restricted.
Once any changes were made it is recommended that we restart the SPARE server and EM services and then check EM failover to see if the process can succeed. In some cases it may be necessary to whitelist vfba.exe and ExacqVision program components (core.exe, edvrclient.exe, including .ps and .psi file types & ExacqVision Enterprise System Manager components) when Antivirus software is in use within the configuration of your Antivirus program.