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H505 error occurs in QuickBooks when the user tries to switch between single-user and multi-user mode. During that course of action, the QuickBooks desktop and application cannot establish a connection with the server and triggers QuickBooks error H505. Here are some of the leading reasons that result in error H505. <br>• The incorrect or damaged .ND files. <br>• The QuickBooks DBXX or QBCF monitor services are not working properly. <br>• The firewall settings are misconfigured. <br>• There are some issues with DNS settings. <br>To fix all these factors, you will need to take some specific measures. Firstly, you will need to ensure that there is only one server with multi-user access. After that, you will have to replace the company file folder, create a new folder on the host computer, and copy the contents into it with full permissions. Further, you will need to check the windows firewall configurations and restart the computer to apply the changes.