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Damaged unpacked_data.txt File Causes Veeam Guest Catalog Service to Not Start

KB ID: 2775
Product: Veeam Backup & Replication
Published: 2018-09-25
Last Modified: 2022-08-10
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Article Applicability
There are many reasons why the Veeam Guest Catalog Service may fail to start, and this KB Article is relevant only when the error shown in the Challenge section is found within the Svc.VeeamCatalog.log file.

Challenge

The Veeam Guest Catalog Service fails to start and the Svc.VeeamCatalog.logDefault Location: C:\ProgramData\Veeam\Backup\ file contains an error similar to:

Attribute "LastSyncTimeUtc" was not found under the tree "".

or

Attribute "VmName" was not found under the tree "oib#". 

Cause

This issue occurs when the contents of the unpacked_data.txtDefault Location: C:\VBRCatalog\Index\Machines\ file have become corrupt and entries are missing.

Solution

To resolve this issue:

  1. Rename the unpacked_data.txt file to append .old after the file extension (unpacked_data.txt.old).
  2. Start the Veeam Guest Catalog Service, and a new unpacked_data.txt file will be created.

More Information

The state of the file can be confirmed by going to the Veeam catalog location (default: C:\VBRCatalog\Index\Machines\).
Open the unpacked_data.txt file and confirm it looks like the below. The actual time synced will vary.

LastSyncTimeUtc=07/13/2020 16:13:05.054
####################################################
# Unpacked guest index data of unregistered OIBs options
KeepUnpackedInHours=48
####################################################
# Temporary unpacked guest index data

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