How many workers are you running in parallel?

OpenSSH server has a configuration directive (MaxStartups) which allows to limit the number of not-yet-authorized connections. The default value is 10.

Regarding strace, as root run: 

echo 0 > /proc/sys/kernel/yama/ptrace_scope

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Then you can attach strace processes to your workers adding the following code to them: 
system "strace -f -o /tmp/strace.$$.out -p $$ &";

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That will dump all the OS calls to the file strace.$$.out. There, you should be able to see the Perl process writing the password to the master pty side and the ssh process reading it from the slave side.

In reply to Re^7: Net::SFTP::Foreign works intermittently by salva
in thread Net::SFTP::Foreign works intermittently by JustPerl

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