PowerProtect FLR Error 409 "A Mount Session is Already Running"

Summary: The PowerProtect Data Manager appliance is used to protect the vSphere environment. The file level restore (FLR) is failing to mount the copy indicating a mount session is already running. ...

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Symptoms

The PowerProtect FLR mount operation generates the error:

screenshot of 409 error code

The PowerProtect Restore > Running Sessions shows no running sessions:

screenshot of PPDM running sessions window

Cause

There are scenarios which can lead to an orphan mount:

  • Multiple attempts to mount or unmount sessions simultaneously can lead to conflicts.
  • Connection issue to the Data Domain during large file level restores.

Resolution

The orphan mount session may be manually cleaned from the PowerProtect environment.

  1. Validate there are no running sessions under Restore > Running Sessions.
  2. Validate there are no running backup sessions under Jobs > Protection Jobs.
  3. Authenticate to the vSphere Web Client and clear the value for the Dell VM Direct Engine Session Custom Attribute on the affected virtual machine.
  4. Open an SSH session to PowerProtect Data Manager and authenticate with the admin account.
  5. Use the Switch Users command and authenticate with the root password: sudo su
  6. Stop the vproxyd service: systemctl stop vproxyd.service
  7. Remove any available FLR blog files from the /opt/emc/vproxy/runtime/state/vproxyd directory: rm -r FlrMountSessions* FlrBrowseSessions* FlrRecoverSessions*
  8. Remove the current date FLR session logs from the /opt/emc/vproxy/runtime/logs/recycle/vproxyd directory: rm -r ./[YYYYMMDD]/*
  9. Start the vproxyd service: systemctl start vproxyd.service
Article Properties
Article Number: 000314719
Article Type: Solution
Last Modified: 17 Sep 2025
Version:  2
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