Acronis Cyber Protect, Acronis Cyber Backup: Registration on Management Server fails if network card is disconnected

Symptoms

You try to install Acronis Cyber Backup 12.5 on a machine where a NIC is disconnected or missing. Both Management Server and Agent are selected for installation.

At 99% of installation progress you get an error:

Registration failed.

Backup agent: "Failed to connect to the management server"

Manual registration fails with an error: ZmqGW return empty AMS addresses list

Cause

Issue in the product.