I believe this is not actually a connect issue, as I can see "title-invalid-e" and I can connect with the same credentials found in my LocalSettings.php file.
Any help would be much appreciated.
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Backtrace:
#0 /var/www/gwart.co.uk/mediawiki/includes/libs/rdbms/loadbalancer/LoadBalancer.php(753): Wikimedia\Rdbms\LoadBalancer->reportConnectionError() #1 /var/www/gwart.co.uk/mediawiki/includes/GlobalFunctions.php(2653): Wikimedia\Rdbms\LoadBalancer->getConnection(0, Array, false) #2 /var/www/gwart.co.uk/mediawiki/includes/cache/localisation/LCStoreDB.php(54): wfGetDB(-1) #3 /var/www/gwart.co.uk/mediawiki/includes/cache/localisation/LocalisationCache.php(410): LCStoreDB->get('en', 'deps') #4 /var/www/gwart.co.uk/mediawiki/includes/cache/localisation/LocalisationCache.php(456): LocalisationCache->isExpired('en') #5 /var/www/gwart.co.uk/mediawiki/includes/cache/localisation/LocalisationCache.php(375): LocalisationCache->initLanguage('en') #6 /var/www/gwart.co.uk/mediawiki/includes/cache/localisation/LocalisationCache.php(294): LocalisationCache->loadSubitem('en', 'messages', 'title-invalid-e...') #7 /var/www/gwart.co.uk/mediawiki/languages/Language.php(2640): LocalisationCache->getSubitem('en', 'messages', 'title-invalid-e...') #8 /var/www/gwart.co.uk/mediawiki/includes/cache/MessageCache.php(984): Language->getMessage('title-invalid-e...') #9 /var/www/gwart.co.uk/mediawiki/includes/cache/MessageCache.php(942): MessageCache->getMessageForLang(Object(LanguageEn), 'title-invalid-e...', false, Array) #10 /var/www/gwart.co.uk/mediawiki/includes/cache/MessageCache.php(884): MessageCache->getMessageFromFallbackChain(Object(LanguageEn), 'title-invalid-e...', false) #11 /var/www/gwart.co.uk/mediawiki/includes/Message.php(1312): MessageCache->get('title-invalid-e...', false, Object(LanguageEn)) #12 /var/www/gwart.co.uk/mediawiki/includes/Message.php(864): Message->fetchMessage() #13 /var/www/gwart.co.uk/mediawiki/includes/Message.php(956): Message->toString('text') #14 /var/www/gwart.co.uk/mediawiki/includes/title/MalformedTitleException.php(49): Message->text() #15 /var/www/gwart.co.uk/mediawiki/includes/title/MediaWikiTitleCodec.php(297): MalformedTitleException->__construct('title-invalid-e...', '') #16 /var/www/gwart.co.uk/mediawiki/includes/Title.php(3752): MediaWikiTitleCodec->splitTitleString('', 0) #17 /var/www/gwart.co.uk/mediawiki/includes/Title.php(378): Title->secureAndSplit() #18 /var/www/gwart.co.uk/mediawiki/includes/MediaWiki.php(83): Title::newFromURL('') #19 /var/www/gwart.co.uk/mediawiki/includes/MediaWiki.php(140): MediaWiki->parseTitle() #20 /var/www/gwart.co.uk/mediawiki/includes/MediaWiki.php(778): MediaWiki->getTitle() #21 /var/www/gwart.co.uk/mediawiki/includes/MediaWiki.php(517): MediaWiki->main() #22 /var/www/gwart.co.uk/mediawiki/index.php(42): MediaWiki->run() #23 {main}