How to fix H101, H202, H303 or H505 and other Multi User setup problems in QuickBooks?

There are several recommended solutions to resolve these errors. The first solution may solve the problem or you may need to try them all to resolve the issue. For best results, perform the solutions in the order shown.


QuickBooks Desktop is trying to establish a connection to the company file and can't communicate with the server (computer hosting the QuickBooks files).

Several issues can cause the following:

  • Hosting configuration settings are incorrect - Another computer might have hosting turned on. Only the server (where the file is saved) should have hosting turned on.
  • QB firewall ports are not set properly - Firewall is blocking incoming/outgoing communication to the company file. The .ND file is damaged or incorrect - The .ND file is a configuration file that allows QuickBooks to access a company file in a network. A damaged .ND file may prevent QuickBooks Desktop from accessing files over the network.
  • QuickBooks can't obtain the IP address of the host computer - QuickBooks Database Server Manager might be using a different/bad IP address.
  • DNS settings are incorrect - Workstations are configured to open the file through the hosts’ Full Qualified Domain Name (ex. computername.domain.com).
  • QuickBooks services are not started - QuickBooksDBXX or QBCFMonitor services are not running and should be started automatically.

Solution 1: Download and use the QuickBooks File Doctor

Download and run the QuickBooks File Doctor on the server and any workstation getting an H-series error. QuickBooks File Doctor will attempt to automatically resolve the multi-user error. SLN40493