Admin "Products" page stays blank (v 1.7.0)

[du5tball]

When I click on "Catalog" -> "Products" in the admin interface, the page stays blank, or rather the webserver answers with Error 500. When I turn on debugging, it works. But who wants to have the debug mode enabled in production?

 

The errorlog reports:

 

 

[Tue Feb 21 15:33:54.893408 2017] [:error] [pid 10147] [client 188.174.153.178:40826] PHP Fatal error:  Uncaught exception 'PDOException' with message 'SQLSTATE[HY000] [2002] Permission denied' in /var/www/domain.tld/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php:43\nStack trace:\n#0 /var/www/domain.tld/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php(43): PDO->__construct('mysql:host=127....', 'user', 'password', Array)\n#1 /var/www/domain.tld/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOMySql/Driver.php(45): Doctrine\\DBAL\\Driver\\PDOConnection->__construct('mysql:host=127....', 'user', 'password', Array)\n#2 /var/www/domain.tld/vendor/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(360): Doctrine\\DBAL\\Driver\\PDOMySql\\Driver->connect(Array, 'user', 'password', Array)\n#3 /var/www/domain.tld/vendor/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(814): Doctrine\\DBAL\\Connection->connect()\n#4 /var/www/domain.tld/vendor/doctrine/orm/lib/Doctrine/ORM/Persisters/Entity/BasicEntityPersister.php(712): Doctrine\\DBAL\\Connection->executeQuery('SELECT t0.id AS in /var/www/domain.tld/app/bootstrap.php.cache on line 3216, referer: https://domain.tld/administration/index.php?controller=AdminDashboard&token=a16eb57c3388ded1d9e4fa99ccd08e96&_token=FKYUKJ5xAo5zC5BQRB0NGX0jIBIhW5Fms_1nrlHVQG0

 

What's suspicious to me is that the host is bogus (127....) although I've set it to localhost whereever applicable.

 

Edit: Turning SELinux off is another thing that apparently works. It's again something I'm not comfortable with. Which SELinux permissions are needed?

Edited February 21, 2017 by du5tball (see edit history)

[du5tball]

I found it: 

httpd_can_network_connect_db

 needs to be enabled. It didn't need to be enabled during installation though, so it seems like prestashop is doing something weird...