Read the DEBUGGING section of IO::Socket::SSL's docs.

It's not a per-object flag, it's a global flag that can be set as follows:
use IO::Socket::SSL qw( debug4 );
or
$IO::Socket::SSL::DEBUG = 4;

In reply to Re: Peeking into a POP3-SSL exchange by ikegami
in thread Peeking into a POP3-SSL exchange by sg

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