The following are some of the reasons that might cause the QuickBooks error H505 message to appear on your screen:
The .ND file might have retained some sort of damage.
Security software (e. g., a firewall) may be blocking access to a computer where the company file is located.
The settings of your hosting configuration might be incorrectly arranged.
QuickBooks is unable to obtain the Internet Protocol (IP) address of the computer where the company file is located.
Solution1: Constitute exceptions in settings for the firewall
To begin with, you will need to click on start and then navigate to the Control Panel section.
Then, you will have to click on the Control Panel then search for the Firewall Settings.
Next, click on the Firewall Settings to Allow a Program through the Firewall.
After that, click on the option of Add Program. Add QuickBooks 20xx to the exception list.
Finally, you must ensure that the changes are applied correctly by restart your computer to end the procedure.
Solution2: Run a check and repair your QuickBooks hosting settings
For the first step, open up your QuickBooks application on both the computers that have been configured into multi-user mode.
Then, you will need to click on the File, then navigate to the utility section. Once there, ensure that you stop hosting Multi-User Configuration.
You must turn on hosting from the file in one computer and then browse to the utility section once again. Once, there select the option to Host Multi-User Configuration.
Now, you will have to restart both the QuickBooks once again.
