XenForo Forum down: Connection refused on line 165 - how can help?

[ses]

Hello,

can someone tell me how to solve this problem?

Thanks

Code:

Fatal error: Uncaught XF\Db\Exception: Connection refused in /var/www-local/web1/html/src/XF/Db/Mysqli/Adapter.php:165

Stack trace:
#0 /var/www-local/web1/html/src/XF/Db/Mysqli/Adapter.php(28): XF\Db\Mysqli\Adapter->makeConnection()
#1 /var/www-local/web1/html/src/XF/Db/AbstractAdapter.php(60): XF\Db\Mysqli\Adapter->getConnection()
#2 /var/www-local/web1/html/src/XF/Db/Mysqli/Adapter.php(113)...

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