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SQL Plugin Job Fails with Error: "Mandatory arguments not set" or "Starting retention policy task"

KB ID: 4786
Product: Veeam Backup & Replication | 12.3.2
Published: 2025-10-16
Last Modified: 2026-10-29
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Challenge

After the upgrade or installation of the patch for Veeam Backup & Replication 12.3.2.4165, existing Veeam Plug-In for Microsoft SQL jobs fail with the following error:

  • Failed to backup database. Error: Mandatory arguments not set
Session failed: Mandatory arguments not set.
Error messages in a backup job log stating "Failed to backup database NEO. Error: Mandatory arguments not set" and "Session failed: Mandatory arguments not set." 
  • Starting retention policy task
Session failed
Backup job summary for database "DB02" showing a failed status. The action log lists successful processing of several databases, followed by errors at "Starting retention policy task" and "Session failed."

Cause

This issue is caused by an incompatibility between the Veeam Plug-in for Microsoft SQL version 12.3.0.310 (or earlier) and Veeam Backup & Replication 12.3.2.4165.
Application entry showing "Veeam Plug-in for Microsoft SQL" version 12.3.0.310

Solution

To resolve this issue, upgrade Veeam Plug-in for Microsoft SQL Server to version 12.3.2.4165.

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