QuickBooks\' H-series issues are all related to the multi-user mode. You can get error code H101 QuickBooks Desktop if something prevents multiple users from connecting to your server. Accessing firm files on the server computer or another workstation is problematic due to this technological issue. This problem suggests that many workstations may be configured as QuickBooks\' server. According to the settings for multi-user mode, only your server the machine that has the corporate file should be able to host the mode.