It's a slightly older version (0.96) so debug4 which I use is the most verbose option. From perldoc IO::Socket::SSL on the server in question;

       use IO::Socket::SSL qw(debug3);
           #Print out progress, ciphers, and errors.

       use IO::Socket::SSL qw(debug4);
           #Print out everything, including data.
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Just to humor you, here is the output from debug3:

SSL connect attempt failederror:14094418:SSL routines:SSL3_READ_BYTES:
+tlsv1 alert unknown ca
 at biz_test.pl line 6
IO::Socket::INET configuration failed
 at biz_test.pl line 6
I encountered a problem: IO::Socket::INET configuration failed at biz_
+test.pl line 20.
IO::Socket::SSL: Timeout    ...caught at biz_test.pl line 23.
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