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VMware vCenter Server rescan failed with “Could not create SSL/TLS secure channel” error

KB ID: 2670
Product: Veeam Backup & Replication | 12 | 12.1 | 12.2 | 12.3 | 12.3.1 | 12.3.2
Published: 2018-06-18
Last Modified: 2026-04-23
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Article Applicability

This article is relevant only to Veeam Backup & Replication 12.x and older because it is strictly related to an issue that affects Windows OSes that were dropped from support starting in Veeam Backup & Replication 13.

This article is related only to issues that occur when Windows Server 2008, 2012, or 2012 R2 is used as part of the Veeam Backup & Replication deployment.

The error listed in this article may occur for other reasons entirely unrelated to the solution provided in this article.

Challenge

When trying to add or to rescan the vCenter Server, the following error occurs:

The request was aborted: Could not create SSL/TLS secure channel

Cause

The issue will happen during the TLS handshake between the Veeam Backup Server and vCenter Server if its certificate signature is generated by an algorithm that is not supported by the OS of the Veeam Backup Server.

Affected OSes:

  • Windows Server 2008R2
  • Windows Server 2012
  • Windows Server 2012R2

Wireshark analysis example: https://blogs.msdn.microsoft.com/friis/2012/08/29/tls-1-2-handshake-failure/
 

Solution

Please install this Microsoft update to resolve the issue:
https://support.microsoft.com/en-us/help/2973337/sha512-is-disabled-in-windows-when-you-use-tls-1-2
You can also add the necessary signature and hash algorithm manually in registry:
Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Cryptography\Configuration\Local\SSL\00010003
Value: Functions

Reboot Veeam server to apply changes.
 

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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