The issue at hand is the inability to list Disks/Volumes of the host in BDRSuite. This can arise due to various reasons:

1. Communication Issue: The agent might be unable to communicate with the server due to a blocked port, specifically Port 32004.

2. Agent Not Running: The agent responsible for listing the disks/volumes on the host may not be running.

3. Improper Agent Installation: The agent might not have been installed correctly on the host.

4. Network Interruption: A network interruption may have occurred while retrieving the drive list.

5. Empty Value in Database: The host's entry in the hostandentitydetails table may have an empty value, leading to the failure to list disks/volumes.

6. Agent Configuration: If the agent was initially added for VM proxy or Hyper-V and later added for DiskImage, and the agent is in a stopped state, the host expansion may not occur.

Here are the recommended solutions for addressing the above-mentioned issues:

1. Verify Port Connectivity: Ensure that Port 32004 is open and not blocked by any firewalls or network configurations to enable proper communication.

2. Check Agent Status: Confirm that the agent responsible for listing the disks/volumes is running correctly. If it is currently stopped, start the agent.

3. Verify Host Status: Check the status of the host in the "Add Windows" page. It should be in an idle state, indicating readiness for operations.