SSHProcessError The ssh process was terminated. at line xxx

##</code><code>##

       my $ssh = Net::SSH::Expect->new (
                host => "$current_server",
                user => "$user",
                raw_pty => 1
        );

        # test the login
        eval {
                 $login_output = $ssh->run_ssh();
        };
        # I've tried to capture $@ or $! here but it never gives me anything useful
        ($ssh->read_all(2) =~ />\s*|$\s*\z/) or die "where's the remote prompt?";
        $ssh->exec("stty raw -echo");