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Started building this site under, from memory, J! 4.0.1 or .2 if that makes any difference. It displays fine on www.ckdev.info/pacific and I can access the /administrator area there as well. However, since uploading to it's real home, www.pacificbreezeairsystems.com, while the frontend works OK, I get: An error has occured 0 in_array(): Argument #2 ($haystack) must be of type array, string given when trying to access the admin, thought the shell of the admin area - without menus etc - shows.

I tried downgrading PHP to 7.4 (mentioned as a possible workaround in another ticket even though the ckdev.info version is running PHP8.0) but just ended up with neither the front nor backends showing at all. Changing back to 8.0 returned things to previous state.

I turned on debug and got:

An error has occurred. 0 in_array(): Argument #2 ($haystack) must be of type array, string given Call stack # Function Location 1 ()     JROOT/plugins/system/admintools/src/Utility/BlockedRequestHandler.php:856 2 in_array()     JROOT/plugins/system/admintools/src/Utility/BlockedRequestHandler.php:856 3 Joomla\Plugin\System\AdminTools\Utility\BlockedRequestHandler->logSecurityException() JROOT/plugins/system/admintools/src/Utility/BlockedRequestHandler.php:436 4 Joomla\Plugin\System\AdminTools\Utility\BlockedRequestHandler->logBlockedRequest() JROOT/plugins/system/admintools/src/Utility/BlockedRequestHandler.php:102 5 Joomla\Plugin\System\AdminTools\Utility\BlockedRequestHandler->logWithoutBlocking() JROOT/plugins/system/admintools/src/Feature/TrackFailedLogins.php:56 6 Joomla\Plugin\System\AdminTools\Feature\TrackFailedLogins->onUserLoginFailure() JROOT/plugins/system/admintools/src/Extension/AdminTools.php:849 7 Joomla\Plugin\System\AdminTools\Extension\AdminTools->runFeature() JROOT/plugins/system/admintools/src/Extension/AdminTools.php:431 8 Joomla\Plugin\System\AdminTools\Extension\AdminTools->onUserLoginFailure() JROOT/libraries/vendor/joomla/event/src/Dispatcher.php:486 9 Joomla\Event\Dispatcher->dispatch() JROOT/libraries/src/Application/EventAware.php:111 10 Joomla\CMS\Application\WebApplication->triggerEvent() JROOT/libraries/src/Application/CMSApplication.php:900 11 Joomla\CMS\Application\CMSApplication->login() JROOT/libraries/src/Application/AdministratorApplication.php:384 12 Joomla\CMS\Application\AdministratorApplication->login() JROOT/administrator/components/com_login/src/Controller/DisplayController.php:80 13 Joomla\Component\Login\Administrator\Controller\DisplayController->login() JROOT/libraries/src/MVC/Controller/BaseController.php:735 14 Joomla\CMS\MVC\Controller\BaseController->execute() JROOT/libraries/src/Dispatcher/ComponentDispatcher.php:146 15 Joomla\CMS\Dispatcher\ComponentDispatcher->dispatch() JROOT/administrator/components/com_login/src/Dispatcher/Dispatcher.php:43 16 Joomla\Component\Login\Administrator\Dispatcher\Dispatcher->dispatch() JROOT/libraries/src/Component/ComponentHelper.php:389 17 Joomla\CMS\Component\ComponentHelper::renderComponent() JROOT/libraries/src/Application/AdministratorApplication.php:143 18 Joomla\CMS\Application\AdministratorApplication->dispatch() JROOT/libraries/src/Application/AdministratorApplication.php:186 19 Joomla\CMS\Application\AdministratorApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:278 20 Joomla\CMS\Application\CMSApplication->execute() JROOT/administrator/includes/app.php:63 21 require_once() JROOT/administrator/index.php:32   I disabled Admin Tools by renaming the provider.php file and the admin area loads correctly. Not sure what I should download to provide you with any further info needed to troubleshoot.

Huh, very strange. I edited the .htaccess files with my "insert-into-every-new-htaccess" code. The site crashed and reverting to the original .htaccess didn't fix the issue. I cleared browser cache (I use Chrome and it has problematic cache) but this didn't help either. I also waited about an hour as I've found sometimes Chrome will "reset" itself  after time, but not this time.

Deleted the files and database, made a new database with a different name and reinstalled the same file I'd used previously, which then had the backend issue. Interestingly, when I logged into the backend this time there were no errors. However, editing the .htaccess file again crashed the site and no reverting to the old file made any difference.

So, doesn't look like Admin Tools was the problem - something else. Now I'll go and reinstall again.

Thanks Nicholas. It all came right on its own. Thanks for the reply! Cheers.