ERROR - 'The Session Is Not Authenticated' During Backup

ERROR - 'The Session Is Not Authenticated' During Backup

KB ID: 55
Cause:
This error is typically encountered when VMware faces difficulties in establishing change block tracking (CBT) due to a failure in identifying changed data blocks.
Solution:
To resolve the issue and reset CBT on the guest VM, follow the steps outlined below:
1. Power off the VM.
2. Right-click the VM, select "Edit settings," navigate to the "Options" tab, and click "Configuration Parameters."
3. Set the "ctkEnabled" value to false.
4. Set the "scsi0:x.ctkEnabled" value to false for each disk of the VM in question.
5. Open the source folder and remove any files with the format -CTK.VMDK.
6. Power on the VM.
7. Power off the VM again. This step is crucial to update the CTK table.
8. Power on the VM.
9. Rerun the backup job.