I have just updated a site that is using Drupal and have now experienced the horrible WSOD.
I have searched through Google looking for any sort of solution/error log to help me find and fix the issue but nothing has worked. I have tried adding in the 'display errors' code in the index.php file and looked at the error_log file in the public directory and nothing.
I can not login to the admin page and check any modules as the login page for this is returning a 403 error.
Any suggestions?
Please go to Apache Error log. You will exact error messages there. The log file's location is different for different OS and versions.
e.g httpd/log/error.log