T:\>perldev 5.20
--------------------------------------------------
5.020003 @ C:\strawberry\perl\bin\perl.exe
--------------------------------------------------
Perl 5.20 T:\>perl a.pl
Perl v5.20.3;
1.4.366563SSH-2.0-libssh2_1.4.3
-5 / LIBSSH2_ERROR_KEX_FAILURE / Unable to exchange encryption keys at a.pl line 14.

Perl 5.20 T:\>exit

T:\>perldev 5.22
--------------------------------------------------
5.022003 @ C:\strawberry\perl\bin\perl.exe
--------------------------------------------------
Perl 5.22 T:\>perl a.pl
Perl v5.22.3;
1.5.066816SSH-2.0-libssh2_1.5.0
-5 / LIBSSH2_ERROR_KEX_FAILURE / Unable to exchange encryption keys at a.pl line 14.

Perl 5.22 T:\>exit

T:\>perldev 5.24
--------------------------------------------------
5.024004 @ C:\strawberry\perl\bin\perl.exe
--------------------------------------------------
Perl 5.24 T:\>perl a.pl
Perl v5.24.4;
1.7.067328SSH-2.0-libssh2_1.7.0
Net::SSH2::DESTROY object 0x2e91e3c