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Proxmox VE Compatibility with Veeam Backup Server OS Server 2012 and 2012 R2

KB ID: 4657
Product: Veeam Backup & Replication | 12.2
Published: 2024-09-23
Last Modified: 2024-09-23
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Article Applicability
This article is relevant only when the machine where Veeam Backup & Replication is installed uses either Server 2012 or Server 2012 R2.

Challenge

After adding Proxmox VE (PVE) hosts to Veeam Backup & Replication, the workers are deployed, but the testing phase fails with the error:

If the server where Veeam Backup & Replication is installed is running Server 2012:

System.ComponentModel.Win32Exception (0x80090308): The token supplied to the function is invalid

If the server where Veeam Backup & Replication is installed is running Server 2012 R2:

Failed to connect to the worker core service: Failed to connect to the backup appliance

Cause

These errors occur because the CBC-based ciphers that Server 2012 and Server 2012 R2 use for TLS1.2 communication are not supported by PVE.

Solution

Option 1: Upgrade the Windows OS

Upgrade the machine that Veeam Backup & Replication is installed on to Windows Server 2016 or newer.

Recomended, considering both Server 2012 and Server 2012 R2 reached End of Life in October of 2023.

 

Solution 2: Apply Security Update 3174644

If an upgrade is not feasible, install Security Advisory# 3174644 to the Server 2012/2012 R2 machine where Veeam Backup & Replication is installed.

If this KB article did not resolve your issue or you need further assistance with Veeam software, please create a Veeam Support Case.

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