Veeam Backup & Replication fails to connect to Linux server with an error about negotiation

KB ID: 2061
Product: Veeam Backup & Replication
Veeam Cloud Connect
Version: Any
Published: 2015-08-28
Last Modified: 2022-03-21
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Challenge

When attempting to add a managed Linux server or edit a Linux repository one of the following errors occurs:
Negotiation failed. The client and the server have no common key exchange algorithm.
Screenshot of Negotiation failed. The client and the server have no common key exchange algorithm.
Negotiation failed. The client and the server have no common encryption algorithm.
Negotiation failed. The client and the server have no common encryption algorithm.
Failed to negotiate key exchange algorithm
Failed to negotiate key exchange algorithm
Client encryption algorithm not found
Client encryption algorithm not found
Server HMAC algorithm not found
Server HMAC algorithm not found

Cause

These errors occur when the Linux server is not configured to allow a Cipher, Key Exchange Algorithm, and MAC Algorithm compatible with the SSH libraries used by Veeam Backup & Replication.

Solution

Starting with Veeam Backup & Replication 11, an additional SSH library is used, allowing for an expanded list of supported Ciphers, Key Exchange Algorithms, and MAC Algorithms. Therefore, it is highly recommended to use the latest version of Veeam Backup & Replication to ensure maximum compatibility.

 

To resolve this connection issue, ensure that the Linux server's sshd is able to use Ciphers, Key Exchange Algorithms, and MAC Algorithms that are compatible with Veeam Backup & Replication.

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