Veeam Support Knowledge Base
The negotiation of encryption algorithm is failed

The negotiation of encryption algorithm is failed

KB ID:	1890
Product:	Veeam Backup & Replication
Version:	6.x, 7.x, 8.x
Published:	2014-05-30
Last Modified:	2020-08-13

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Challenge

When trying to restore files from a Veeam appliance to the original location using Other OS restore, the following error is received: "The negotiation of encryption algorithm is failed"

Cause

Between Linux flavors, certain Ciphers may be enabled or disabled by default or by local policy.

Solution

8.0

Install the latest update for Veeam Backup and Replication. This enables aes128-ctr, aes192-ctr, aes256-ctr, aes192-cbc and aes256-cbc in addition to the already existing 3des-cbc, blowfish-cbc, and aes128-cbc.

A more secure Ciphers line would be:

Ciphers aes128-ctr,aes192-ctr,aes256-ctr,aes192-cbc,aes256-cbc

6.x and 7.x:

Make sure that at least one of the following algorithms are included on your Ciphers line:

Ciphers 3des-cbc,blowfish-cbc,aes128-cbc

More Information

If your security policy requires deleting this string, then it needs to be re-added every time you need to restore files to the original location.

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