CF6 form with just over 100 checkboxes (for a survey) now generates an HTML error 500 message when I try to edit

fa farscape 09 Aug, 2018
The setup is fairly basic ... writing a header record in one table and each response in another. Using partitions.

Has anyone else experienced this and, more importantly, found a fix, or is there a limit to how many fields one form can have?

Thanks!
fa farscape 10 Aug, 2018
Hi healyhatman. What setting, and what should it be?

Thanks!
fa farscape 10 Aug, 2018
Answer
OK, I got it working! Based on input from the site host, healyhatman, my ISP and Bob at Chronoengine, I made the following changes, in this order, and tested each before trying the next:
  1. increased memory_limit in php.ini (suggested by the site's host)
  2. switched from fast CGI to CGI (suggested by the site's host)
  3. turned off mod_security (Suggested above by healyhatman. I've since turned that back on)
  4. increased max_input_vars in php.ini (suggested by Bob, who said "a form with 100 checkboxes could have several thousand inputs in the admin form.")
  5. increased max_execution_time in php.ini (Bob also suggested turning on Joomla error reporting, which revealed a timeout error. That last item in the list did the trick, although the other things might have contributed.)
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