Warning: mysqli_connect(): php_network_getaddresses: getaddrinfo for wallenboeck.synology.me failed: Name or service not known in /home/.sites/140/site738/web/meldestelle.horse/verbindungsaufbau.php on line 3

Fatal error: Uncaught mysqli_sql_exception: php_network_getaddresses: getaddrinfo for wallenboeck.synology.me failed: Name or service not known in /home/.sites/140/site738/web/meldestelle.horse/verbindungsaufbau.php:3
Stack trace:
#0 /home/.sites/140/site738/web/meldestelle.horse/verbindungsaufbau.php(3): mysqli_connect('wallenboeck.syn...', 'MeldestelleWeb', Object(SensitiveParameterValue), 'MeldestelleWeb')
#1 /home/.sites/140/site738/web/meldestelle.horse/konfiguration_plattform.php(21): require_once('/home/.sites/14...')
#2 /home/.sites/140/site738/web/meldestelle.horse/index.php(15): require_once('/home/.sites/14...')
#3 {main}
  thrown in /home/.sites/140/site738/web/meldestelle.horse/verbindungsaufbau.php on line 3