Database check failed when upgrading from 7.3.x to 7.4.3

Hi guys, I had an issue with the database check from the upgrade wizard which was solved with the following hack:

Edit crm/modules/UpgradeWizard/systemCheck.php and add the following line: “$db = DBManagerFactory::disconnectAll();” just above "$db = DBManagerFactory::getInstance(); "

Thank you Pritam for providing the solution in your Blog

I have now upgraded to 7.4.3