Here's one thing to help with getting debug info right away 
#!/usr/bin/perl 
# consent.cgi
BEGIN { use CGI::Carp 'fatalsToBrowser'; }

use strict;
use warnings;
use CGI qw(:standard);
use Fcntl ':flock';
# ......

# as a curiosity also.. 
my $iam = `whoami`;

open(STDERR, '>>', '/home/myself/errlog') or die($!);
warn("I am [$iam]");

[download]
Can you log into the machine via ssh?? Then.. 
bash # tail -f /home/myself/errlog

After that hold the shell window on one side, and run the script on the other to see the output real time

In reply to Re: a classic : 'Premature end of script headers' problem by leocharre
in thread a classic : 'Premature end of script headers' problem by hmbscully

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.