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$socket = IO::Socket::SSL->new ( PeerAddr => $ip, ... SSL_key_file => 'client-key.pem', SSL_cert_file => 'client-cert.pem', );
my $socket = IO::Socket::SSL->new ( PeerAddr => $ip, ... SSL_verify_mode => 1, ); print $socket ? "OK\n" : "FAILED\n";