[Ssh-sftp-perl-users] Problems connecting to one site but not another

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I have a very simple script that connects to a server (domain1) but on
trying to configure it to a new site (domain2) I get an error.

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Manual connection via SSH works OK for both sites, it is just the script
that has trouble. Here is the script configured for domain2

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#!/usr/bin/perl -w

use strict;

use warnings;

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use Net::FTP;

use Net::SFTP;

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my $ftp;

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eval {

    $ftp =3D Net::SFTP->new('domain2.com',

        user =3D> 'myuser',

        debug =3D> 1,

        );

};

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if ($@) {

    print "login failed [$@]\n";

}

1;

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Error output is

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login failed [Key class 'Net::SSH::Perl::Key::RSA' is unsupported: Can't
locate Compress/Raw/Zlib.pm in @INC (@INC contains: <snip> .) at
/work/perl-modules/lib/Compress/Zlib.pm line 12.

BEGIN failed--compilation aborted at
/work/perl-modules/lib/Compress/Zlib.pm line 12.

Compilation failed in require at
/work/perl-modules/lib/Convert/ASCII/Armour.pm line 15.

BEGIN failed--compilation aborted at
/work/perl-modules/lib/Convert/ASCII/Armour.pm line 15.

Compilation failed in require at /work/perl-modules/lib/Crypt/RSA.pm
line 20.

BEGIN failed--compilation aborted at /work/perl-modules/lib/Crypt/RSA.pm
line 20.

Compilation failed in require at
/work/perl-modules/lib/Net/SSH/Perl/Key/RSA.pm line 15.

BEGIN failed--compilation aborted at
/work/perl-modules/lib/Net/SSH/Perl/Key/RSA.pm line 15.

Compilation failed in require at (eval 24) line 1.

BEGIN failed--compilation aborted at (eval 24) line 1.

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The point here is that we have never had to use Compress::Zlib before
(on any of our other site connections) so why do we need it now.
(Installing it does not seem to be an option for reasons I don't want to
go into at the moment!)

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Comparing the full (debug) output from the two servers, here is the
output for the successful connection.

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localhost: Reading configuration data /home/username/.ssh/config

localhost: Reading configuration data /etc/ssh_config

localhost: Connecting to domain1.com, port 22.

localhost: Remote version string: SSH-1.99-OpenSSH_3.7.1p2

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localhost: Remote protocol version 1.99, remote software version
OpenSSH_3.7.1p2

localhost: Net::SSH::Perl Version 1.30, protocol version 2.0.

localhost: No compat match: OpenSSH_3.7.1p2.

localhost: Connection established.

localhost: Sent key-exchange init (KEXINIT), wait response.

localhost: Algorithms, c->s: 3des-cbc hmac-sha1 none

localhost: Algorithms, s->c: 3des-cbc hmac-sha1 none

localhost: Entering Diffie-Hellman Group 1 key exchange.

localhost: Sent DH public key, waiting for reply.

localhost: Received host key, type 'ssh-dss'.

localhost: Host 'domain1.com' is known and matches the host key.

localhost: Computing shared secret key.

localhost: Verifying server signature.

localhost: Waiting for NEWKEYS message.

localhost: Enabling incoming encryption/MAC/compression.

localhost: Send NEWKEYS, enable outgoing encryption/MAC/compression.

localhost: Sending request for user-authentication service.

localhost: Service accepted: ssh-userauth.

localhost: Trying empty user-authentication request.

localhost: Authentication methods that can continue:
publickey,password,keyboard-interactive.

localhost: Next method to try is publickey.

localhost: Trying pubkey authentication with key file
'/home/username/.ssh/id_dsa'

localhost: Login completed, opening dummy shell channel.

localhost: channel 0: new [client-session]

localhost: Requesting channel_open for channel 0.

localhost: channel 0: open confirm rwindow 0 rmax 32768

localhost: channel 1: new [client-session]

localhost: Requesting channel_open for channel 1.

localhost: Sending subsystem: sftp

localhost: Requesting service subsystem on channel 1.

localhost: channel 1: open confirm rwindow 0 rmax 32768

localhost: sftp: Sending SSH2_FXP_INIT

localhost: sftp: Remote version: 3

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Whereas here is the full output for the failed connection.

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localhost: Reading configuration data /home/username/.ssh/config

localhost: Reading configuration data /etc/ssh_config

localhost: Connecting to domain2.com, port 22.

localhost: Remote version string: SSH-2.0-JSCAPE3.4.0

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localhost: Remote protocol version 2.0, remote software version
JSCAPE3.4.0

localhost: Net::SSH::Perl Version 1.30, protocol version 2.0.

localhost: No compat match: JSCAPE3.4.0

localhost: Connection established.

localhost: Sent key-exchange init (KEXINIT), wait response.

localhost: Algorithms, c->s: 3des-cbc hmac-sha1 none

localhost: Algorithms, s->c: 3des-cbc hmac-sha1 none