The way to check for errors on Net::SFTP::Foreign is calling the error method: 
$sftp->put(...);
if ($sftp->error) { ... };

[download]
Or alternatively, use the autodie feature: 
my $sftp = Net::SFTP::Foreign->new(..., autodie => 1);

[download]
In order to activate debugging set... 
$Net::SFTP::Foreign::debug = -1;

[download]

Also, note that libssh2/Net::SSH2 are somewhat buggy. Ensure that at least you are using the latest versions.

In reply to Re: debugging Net::Sftp::Foreign using ssh2 by salva
in thread debugging Net::Sftp::Foreign using ssh2 by sdetweil

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