How-To-Secure-A-Linux-Server
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sshd_config protocol 1 support completely removed resulting in protocol option being removed
The protocol option has been removed, as openssh now only supports and uses protocol 2.
Therefor we should remove the protocol 2 key-value pair from sshd_config
Source: openssh, release 7.6
ssh(1): delete SSH protocol version 1 support, associated configuration options and documentation.