More see here:
Check and config SSHv1 or SSHv2 on GAIA
If you want to check what SSH protocol version are supported by a local OpenSSH server, you can refer to /etc/ssh/sshd_config file. Open /etc/ssh/sshd_config with a vi editor, and look for "Protocol" field. You can also config the version over this parameter. If you change the paarameter so you should restart sshd.
If it shows the following, it means that OpenSSH server supports SSH2 only.
Protocol 2
If it displays the following instead, OpenSSH server supports both SSH1 and SSH2.
Protocol 1,2
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