Status 500 on missing MySQL Database

[christianhauff]

Steps to reproduce

1. MySQL-Server is crashed
2. Try to open nextcloud

Expected behaviour

If the server is crashed, nextcloud should display an error message describing the problem

Actual behaviour

I get an HTTP ERROR 500, my apache error_log says the following:

[Thu Mar 30 09:33:11 2017] [warn] [client xx.xx.xx.xx] mod_fcgid: stderr: PHP Fatal error: Uncaught exception 'Doctrine\\DBAL\\DBALException' with message 'Failed to connect to the database: An exception occured in driver: SQLSTATE[HY000] [2002] Connection refused' in /var/www/cloud.xxxxx.de/lib/private/DB/Connection.php:60

Server configuration

CentOS 6

Web server:
Apache 2.2

Database:
MySQL 5.1

PHP version:
5.6.21

Nextcloud version: (see Nextcloud admin page)
11.0.2

[MorrisJobke]

We do this, to not expose the error message. You can find it in the logs and this is there to not expose details that would help an attacker to get internal information. So this is intended.