QNAP NAS Nextcloud Install Error Resolution

I need an expert in software installation, specifically Nextcloud on a QNAP NAS. The installation has been completed, but not without a few errors. One consistent issue was an exception in the driver with the message: SQLSTATE [HY000] [2002]. I require someone who can: - Understand and rectify the SQLSTATE [HY000] [2002] error. - Ensure the Nextcloud installation is correctly done and operational. An ideal applicant would have experience troubleshooting and resolving installation errors on a QNAP NAS system, particularly with Nextcloud software. Deep understanding of software dependencies and database connectivity is also essential. This is an urgent requirement so prompt response is much appreciated. THE WHOLE ERROR MESSAGE IS: Exception Failed to connect to the database: An exception occurred in the driver: SQLSTATE[HY000] [2002] Connection refused /var/www/html/3rdparty/doctrine/dbal/src/[login to view URL] line 1654 OC\DB\Connection->connect() /var/www/html/3rdparty/doctrine/dbal/src/[login to view URL] line 1081 Doctrine\DBAL\Connection->getWrappedConnection() /var/www/html/lib/private/DB/[login to view URL] line 261 Doctrine\DBAL\Connection->executeQuery( "SELECT * FROM `oc_appconfig`", [], [], null ) /var/www/html/3rdparty/doctrine/dbal/src/Query/[login to view URL] line 337 OC\DB\Connection->executeQuery( "SELECT * FROM `oc_appconfig`", [], [], null ) /var/www/html/3rdparty/doctrine/dbal/src/Query/[login to view URL] line 377 Doctrine\DBAL\Query\QueryBuilder->executeQuery() /var/www/html/lib/private/DB/QueryBuilder/[login to view URL] line 280 Doctrine\DBAL\Query\QueryBuilder->execute() /var/www/html/lib/private/[login to view URL] line 421 OC\DB\QueryBuilder\QueryBuilder->execute() /var/www/html/lib/private/[login to view URL] line 187 OC\AppConfig->loadConfigValues() /var/www/html/lib/private/[login to view URL] line 377 OC\AppConfig->getApps() /var/www/html/lib/private/legacy/[login to view URL] line 734 OC\AppConfig->getValues( false, "installed_version" ) /var/www/html/lib/private/[login to view URL] line 236 OC_App::getAppVersions() /var/www/html/lib/private/legacy/[login to view URL] line 142 OC\TemplateLayout->__construct( "error", "" ) /var/www/html/lib/private/Template/[login to view URL] line 132 OC_Template->fetchPage() /var/www/html/lib/private/legacy/[login to view URL] line 291 OC\Template\Base->printPage() /var/www/html/[login to view URL] line 104 OC_Template:?rintExceptionErrorPage( [ "Doctrine\\DBAL\\Exception" ], 500 ) Raw log entry { "reqId": "RG7bBOUcQ8gbfeHNH0XK", "level": 3, "time": "2024-03-26T09:57:32+00:00", "remoteAddr": "[login to view URL]", "user": "--", "app": "core", "method": "GET", "url": "/[login to view URL]", "message": "Exception thrown: Doctrine\\DBAL\\Exception", "userAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/[login to view URL] Safari/537.36 Edg/[login to view URL]", "version": "[login to view URL]", "exception": { "Exception": "Doctrine\\DBAL\\Exception", "Message": "Failed to connect to the database: An exception occurred in the driver: SQLSTATE[HY000] [2002] Connection refused", "Code": 2002, "Trace": [ { "file": "/var/www/html/3rdparty/doctrine/dbal/src/[login to view URL]", "line": 1654, "function": "connect", "class": "OC\\DB\\Connection", "type": "->", "args": [] }, { "file": "/var/www/html/3rdparty/doctrine/dbal/src/[login to view URL]", "line": 1081, "function": "getWrappedConnection", "class": "Doctrine\\DBAL\\Connection", "type": "->", "args": [] }, { "file": "/var/www/html/lib/private/DB/[login to view URL]", "line": 261, "function": "executeQuery", "class": "Doctrine\\DBAL\\Connection", "type": "->", "args": [ "SELECT * FROM `oc_appconfig`", [], [], null ] }, { "file": "/var/www/html/3rdparty/doctrine/dbal/src/Query/[login to view URL]", "line": 337, "function": "executeQuery", "class": "OC\\DB\\Connection", "type": "->", "args": [ "SELECT * FROM `oc_appconfig`", [], [], null ] }, { "file": "/var/www/html/3rdparty/doctrine/dbal/src/Query/[login to view URL]", "line": 377, "function": "executeQuery", "class": "Doctrine\\DBAL\\Query\\QueryBuilder", "type": "->", "args": [] }, { "file": "/var/www/html/lib/private/DB/QueryBuilder/[login to view URL]", "line": 280, "function": "execute", "class": "Doctrine\\DBAL\\Query\\QueryBuilder", "type": "->", "args": [] }, { "file": "/var/www/html/lib/private/[login to view URL]", "line": 421, "function": "execute", "class": "OC\\DB\\QueryBuilder\\QueryBuilder", "type": "->", "args": [] }, { "file": "/var/www/html/lib/private/[login to view URL]", "line": 187, "function": "loadConfigValues", "class": "OC\\AppConfig", "type": "->", "args": [] }, { "file": "/var/www/html/lib/private/[login to view URL]", "line": 377, "function": "getApps", "class": "OC\\AppConfig", "type": "->", "args": [] }, { "file": "/var/www/html/lib/private/legacy/[login to view URL]", "line": 734, "function": "getValues", "class": "OC\\AppConfig", "type": "->", "args": [ false, "installed_version" ] }, { "file": "/var/www/html/lib/private/[login to view URL]", "line": 236, "function": "getAppVersions", "class": "OC_App", "type": "::", "args": [] }, { "file": "/var/www/html/lib/private/legacy/[login to view URL]", "line": 142, "function": "__construct", "class": "OC\\TemplateLayout", "type": "->", "args": [ "error", "" ] }, { "file": "/var/www/html/lib/private/Template/[login to view URL]", "line": 132, "function": "fetchPage", "class": "OC_Template", "type": "->", "args": [] }, { "file": "/var/www/html/lib/private/legacy/[login to view URL]", "line": 291, "function": "printPage", "class": "OC\\Template\\Base", "type": "->", "args": [] }, { "file": "/var/www/html/[login to view URL]", "line": 104, "function": "printExceptionErrorPage", "class": "OC_Template", "type": "::", "args": [ [ "Doctrine\\DBAL\\Exception" ], 500 ] } ], "File": "/var/www/html/lib/private/DB/[login to view URL]", "Line": 139, "CustomMessage": "Exception thrown: Doctrine\\DBAL\\Exception" }, "id": "6602c0b2dde57" }