


The database server is unable to open the company file.Firewall or antivirus software is not allowing communication between user computers.Possibly that the hosting settings are not properly configured.QuickBooks is not installed on the server.

The following are some reasons for QuickBooks multi-user mode not working: Thank you for providing details of your concern, meadowmt. What else can I try to resolve this? Sorry to be long winded and thanks for your help in advance. I was able to move the file to host on another computer that does not run the QuickBooks desktop software and multi-user mode works fine this way, however this third computer is not a viable option as it is a laptop and leaves the office regularly. I have completely disabled and uninstalled all firewalls, checked network settings, ran File Doctor which says it finds issues but the problem persists. I have had countless setups before where the computer hosting the file was also running QuickBooks and never had this issue on older versions of QuickBooks. Computer 1 cannot successfully switch the company file to multi-user, only computer 2. Then and only then can computer 1 and computer 2 be logged into the same company file simultaneously. The only way I can get multi user to work is for Computer 1 (Hosting Computer) to close QuickBooks, Computer 2 then logs into QuickBooks and switches from Single User to Multi-User. When computer 1 switches to single user mode and then back to multi-user mode, computer 2 can no longer login to QuickBooks. Computer 1 hosts and uses QuickBooks daily and has to run a routine that requires QuickBooks to go into Single user mode sometimes multiple times a day. I am using QuickBooks Desktop Pro 2020 on two machines running Windows 10 Pro and having issues with multi-user mode.
