Troubleshooting - WAMP Server and EasyPHP

If you use WAMP Server or EasyPHP as your development server, you may encounter a problem when clicking "Configure" on any applications. This is because the default thread stack size is too small. This error does not occur on Linux or OS X, only on Apache for Windows on those three Windows/Apache/MySQL/PHP stacks. If you use IIS/PHP/MySQL, you can ignore this troubleshooting note.

How to reproduce this problem

  1. Click Settings » Wysiwyg Editors » tinymce4 or ckeditor4
  2. Click any of the WYSIWYG editor profile
  3. You will get "This page cannot be loaded"

When you take a look at the Apache log file, you will encounter something like "Starting 64 worker threads":


[Tue Aug 01 15:22:12.982280 2017] [mpm_winnt:notice] [pid 5904:tid 492] AH00418: Parent: Created child process 4736
[Tue Aug 01 15:22:13.472720 2017] [mpm_winnt:notice] [pid 4736:tid 616] AH00354: Child: Starting 64 worker threads.
[Tue Aug 01 15:22:17.269820 2017] [mpm_winnt:notice] [pid 5904:tid 492] AH00428: Parent: child process 4736 exited with status 3221225725 -- Restarting.


[Tue Aug 01 13:15:32.603882 2017] [mpm_winnt:notice] [pid 4268:tid 428] AH00418: Parent: Created child process 3564
[Tue Aug 01 13:15:32.963099 2017] [auth_digest:notice] [pid 3564:tid 472] AH01757: generating secret for digest authentication ...
[Tue Aug 01 13:15:32.994933 2017] [mpm_winnt:notice] [pid 3564:tid 472] AH00354: Child: Starting 64 worker threads.
[Tue Aug 01 13:18:04.056656 2017] [mpm_winnt:notice] [pid 4268:tid 428] AH00422: Parent: Received shutdown signal -- Shutting down the server.
[Tue Aug 01 13:18:06.088036 2017] [mpm_winnt:notice] [pid 3564:tid 472] AH00364: Child: All worker threads have exited.
[Tue Aug 01 13:18:06.119288 2017] [mpm_winnt:notice] [pid 4268:tid 428] AH00430: Parent: Child process 3564 exited successfully.


Search for httpd.conf inside WAMP or EasyPHP directory, and add the following line before any inclusion of httpd-vhosts.conf.

<IfModule mpm_winnt_module>
   ThreadStackSize 8388608

Please note that you cannot add the 3 lines above in your .htaccess file and you will get an error ThreadStackSize not allowed here in your Apache log file