What should people do if they encounter QuickBooks Error H505? December 20, 2021, 06:51:53 AM When you need to alter or adjust the hosting settings or configuration parameters, you will notice 'QuickBooks Error h505.' If there is a problem with the Windows file, the error may also be shown. ND file, or when network security programs prevent a machine from accessing the internet. The message is shown when network security software rejects access to a PC. Other issues include the QuickBooksDBXX service not being able to start or incorrect DNS configuration.