Avamar: VM image backups fail "No Proxy" because VM lacks a hard disk

The Activity Monitor in the Avamar UI shows 'No Proxy'.

On-demand VMware Image backup fails with the following:

Category: APPLICATION
Severity: PROCESS
Summary: Failed to initiate virtual machine backup or restore.
Event Information:
Event Code: 30931
Category: APPLICATION
Severity: PROCESS
Summary: Failed to initiate virtual machine backup or restore.

If a group backup request is initiated:
 

1. Open vCenter
2. Find the VM that is failing with 'No Proxy'
3. Edit the VM settings and verify if there are any Hard Disks
4. If there are no Hard Disks, check with the VM Administrator and contact VMware support. If a backup of the VM is no longer required, retire the VM object in Avamar.

• Avamar VM image backups fail with "No Proxy" because no proxy servers are configured to protect the datastore holding the client’s VMDKs
• Avamar VM image backups fail with "No Proxy" error due to interrupted vCenter connection
• Avamar VM image backups fails with "No Proxy" error due to the VM not having any hard disks
• Avamar VM image backups fail with "No Proxy" because the proxy is powered off in vCenter
• Avamar VM image backups fail with "No Proxy" error due to proxies not resolving in DNS