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