Backups to RDA repository fail with "Error: 3181 - FATAL rofs_ver_check RDA SDK failed trying to verify server version (Operation timedout)" (4040688)

• VA backups are failing to the DR device.
• Backups using Machine-LAN transport works without any problem. 
• A Windows FLR can be performed from the DR device. 

The error message is as follows:

Error: 3181 - FATAL rofs_ver_check RDA SDK failed trying to verify server version (Operation timedout) [at rofs_version_check:182]

If the DR device is in a isolated network segment not reachable with the current NIC, a secondary NIC can be added to the Virtual Appliance in order to allow communication.