NVP vProxy: Failed to lock Virtual Machine for backup: Another vProxy operation is active on VM

INFO: [@(#) Build number: ###] Another vProxy operation is active on VM vm-XXX: {Operation:Backup StartTime:2017-05-15T10:09:21Z Proxy:<vProxy>SessionId:4cf6f76c-ef6c-435d-880c-77fbaf49exxx} 
ERROR: [@(#) Build number: ###] Failed to lock Virtual Machine for backup: Another vProxy operation is active on VM vm-XXX: {Operation:Backup StartTime:2017-05-15T10:09:21Z Proxy:<vProxy> SessionId:4cf6f76c-ef6c-435d-880c-77fbaf49e1xxx}. Session logs can be found on the NetWorker server under ..\nsr\logs\policy\POLICY_NAME\WORKFLOW_NAME

The VM was marked as "backup locked" due to previous backup error or interruption.

The vmconfig command can be used to verify if the VM is backup locked.

1. Log in to vProxy as admin over SSH, then switch to root.

sudo su -

2. Change to bin directory

cd  /opt/emc/vproxy/bin

3. Run below command to load library path:​​​​​​​​​​​​​​

source ../unit/vproxy.env

4. Check if the backup is locked with 'vmconfig' tool using the MoREF value from the session log: 

./vmconfig -c info -k "vm-MoRef" -l moref -v vCENTER_NAME -u "vCENTER_USERNAME" -p 'PASSWORD'

  Searching for virtual machine with MORef "vm-XXX" ...
            Querying vCenter for definition of virtual machine with MORef of "vm-XXX" ...
            Found virtual machine "VM_NAME" with MORef "vm-xxx".
            vm-145501: Name: "VM_NAME".
            vm-145501: CBT Enabled: true.
            vm-145501: Migration Enabled: false.
            vm-145501: Backup Locked: true.

Option 1

Use the ProxyHC utility on the vProxy to cleanup: NVP-vProxy: How to use health check tool ProxyHC on vProxy appliance

The syntax required is:

./ProxyHC tasks cleanup

Option 2

1. Log in vSphere client
2. Select the affected VM
3. In the General tab, go to Custom Attributes, click Edit:

4. Select each custom attribute that contains "Dell EMC vProxy," and Delete it: