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Effectively the same as this (Drupal 500 Internal server error on login page) but i am unable to bump or comment so resorting to adding my own question.

The site is running Drupal 7.54 php version 7 and uses LoginToboggan module with login.

I am receiving "500 (Service unavailable (with message))" on the user and register pages, this occurs against user/login and ?q=user/login equivalent. Otherwise the site operates normally. There are no PHP errors in the log or browser console so i have nothing to try and trace.

I have amended the .htaccess file to use Rewrite as suggested elsewhere (this was already enabled anyway as the site sits in a subdomain).

Clean URLs are enabled.

I have added error reporting to settings.php to try and pick up on errors i've otherwise missed, nada.

I have used phpMyAdmin to clear the sessions table as suggested on another old thread. This resulted in me being kicked out and unable to get back in.

I can now only access the site db via phpMyAdmin and the site files via ftp (unable to log in as admin as login throws the error)

I tried to run update.php (removing login requirement from settings) out of sheer desperation but this had no effect.

Again in desperation i removed the LoginToboggan module (via ftp, i know) to try and revert the login to core but this had no effect.

I thought the main domain was conflicting in some way so i removed it (it wasn't actually used for anything and had an independent db so i just uninstalled it. No effect.

I really am at a loss, i can't figure out the cause and so have no way to implement a fix..

  • Hard to give an answer to your problem without some kind of log, but. To disable a module from the DB, you set the status to 0 in the system table. A list of handy commands: drupal.org/node/157632 . Additionally, you can login, enable, disable etc. using Drush. Login is drush uli (that will be user 1) and uninstall would be drush pmu module_name, see: drushcommands.com – mediaashley Apr 12 '17 at 16:43
  • The command list is useful thank you. I have now disabled LoginToboggan though no change. If you could suggest where else i might find an explicit error i'll take a look but i really am at a loss. – benj Apr 12 '17 at 17:01
  • I assume you have dblog turned on? Then you should get watchdog errors in reports. It's called Recent log messages at /admin/reports/dblog. Other than that, I can't think of anything just now… Is this on your local or online? – mediaashley Apr 12 '17 at 17:07
  • I can't access the reports page but i thought i had.. The site is online. I should have added it had been (more or less) working fine for some-time. – benj Apr 12 '17 at 17:11
  • If you still can't login (I'm assuming you don't have Drush) you can see the reports in the DB, suddenly not sure what the table is called, but I think it's in the watchdog table. I would recommend you spin up a local copy and use Drush. – mediaashley Apr 13 '17 at 9:25
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As you have access to the database through PhpMyAdmin, have a look in the watchdog table for any errors.

Disable anything causing an issue ;)

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