You can start looking at your environment variables under ssl. Try running this as a secure CGI. It will show you all info it has available:

   #!/usr/local/bin/perl 

   print "Content-type: text/html\n\n"; 
   print "<tt>\n"; 
   foreach $key (sort keys(%ENV)) { 
      print "$key = $ENV{$key}<p>"; 
   }
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