I ramdomly get "Killed by signal 15." on STDERR as well. I've added these two lines to see if this will resolve my issues. My next step will be to localize the signal. 
  $sftp->disconnect; #try to avoid random error "Killed by signal 15."
  undef $sftp;

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Version 
$ rpm -q --whatprovides 'perl(Net::SFTP::Foreign)'
perl-Net-SFTP-Foreign-1.75-1.el6.noarch

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In reply to Re^2: Net::SFTP::Foreign message on disconnect by mrdvt92
in thread Net::SFTP::Foreign message on disconnect by runrig

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