Typically, it is best to restart the service using the command Some systems offer an option in the GUI to disable or re-enable SSH logon, but these do not always actually restart the daemon. Then, to generate the newly added keys, runĪnd restart the sshd service on the machine (reboot works fine, too). Hmac-md5, hmac-md5-96, hmac-sha1, hmac-sha1-96, hmac-sha2-256, hmac-sha2-256-96, hmac-sha2-512, hmac-sha2-512-96, hmac-ripemd160, the man page for your sshd_config file and/or query for the supported ciphers, key exchange algorithms and keyed-hash message authentication codes using the following command: Review the configuration of your /etc/ssh/sshd_config file and verify at least one of the Ciphers, KexAlgorithms, and MACs listed below are presentģdes-cbc, aes128-cbc, aes192-cbc, aes256-cbc, aes128-ctr, aes192-ctr, aes256-ctr, blowfish-cbc, cast128-cbc, arcfour, twofishĭiffie-hellman-group-exchange-sha256, diffie-hellman-group-exchange-sha1, diffie-hellman-group14-sha1, diffie-hellman-group1-sha1
When Veeam connects to a Linux target, we require Diffie-Helman key exchange capabilities for successful secure connections and to reduce the possibility that a password will not be intercepted when authenticating to the storage. In some Linux distributions, /etc/ssh/sshd_conf is missing the KexAlgorithms and Cipher fields to describe which methods are supported by the SSH daemon. Failed to negotiate key exchange algorithm When attempting to add a managed Linux server, you may receive one of the errors below.