One other thing that I noticed is that in your while loop over your commands you are calling the expect method with the 600 sec timeout before the send method. Perhaps it is still using a default timeout?

In reply to Re^3: My Perl/Expect script aborts when sftp connection stalls at remote destination by zow
in thread My Perl/Expect script aborts when sftp connection stalls at remote destination by c84032002

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