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my %args = (
    user     => 'user', 
...
            ]
    ],
);

eval { $sftp = Net::SFTP->new($host, %args) };
die "Connection failed: $!\n" if $!;
die "No SFTP object\n" unless $sftp;

wolf: Reading configuration data /home/insaniac/.ssh/config
wolf: Reading configuration data /etc/ssh_config
...
wolf: Authentication methods that can continue: publickey,keyboard-int
+eractive.
wolf: Next method to try is publickey.
Connection failed: No such file or directory