-1
and -2
: specify an SSH protocol version
The -1
and -2
options force PuTTY to use version 1 or version 2 of the SSH protocol. These options are only meaningful if you are using SSH.
These options are equivalent to selecting your preferred SSH protocol version as ‘1 only’ or ‘2 only’ in the SSH panel of the PuTTY configuration box (see section 4.18.4).