When you open a company file in multi-user mode, you see an error:
Note: Intuit does not support firewall or anti-virus programs. You may need to consult the program provider for assistance with installing and setting up your program.
Why this is happening
QuickBooks 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 these errors:
Resolving QuickBooks errors: H101, H202, H303, and H505
Intuit recommends several solutions for resolving errors. The first solution may solve your problem, or you may need to try all of them to resolve the issue. For best results, perform the solutions in the order shown.
If you still see the error, try the next solution.
In a multi-user environment, hosting should only be enabled on the hosting computer (server).
When working with QuickBooks in a multi-user mode, QuickBooks services need to be running on the server computer.
IMPORTANT (Windows 8): AVG Antivirus 2013 users: In depth research by our engineering team has determined that a conflict exists between QuickBooks and AVG AntiVirus 2013 on Windows 8. The conflict has been isolated to AVG, and if you are using AVG AntiVirus 2013 or AVG Antivirus 2013 Free on Windows 8 and have an H202 error, you will need to uninstall the AVG program and enable Windows Defender (built into Windows 8). You will need to contact AVG support if you have any questions or wish to keep the AVG 2013 software.
Perform the following on each computer:
Important: These steps are highly technical in nature and may be best performed by a qualified IT professional present. The scope of this test is to see if QuickBooks can reach the server from the workstation(s).
It may be necessary to edit the Windows hosts file.
If you have tried all of the solutions in this article and still experience H101, H202, H303, or H505 errors in QuickBooks, please sign up below to be notified when an update is made available.