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Get help if you have questions or experience issues when connecting to QuickBooks Desktop

IssueResolution
Could not start QuickBooksThe web connector was unable to connect to QuickBooks. Please restart the computer hosting the QuickBooks web connector and try again.
The user you are trying to log in with is already logged in from another machine.The user configured for accessing quickbooks is currently in use. Please log out of other instances of Quickbooks Desktop and try again.
The application trying to connect to QuickBooks is not supported while multiple instances of QuickBooks are running.Cannot connect to QuickBooks while multiple instances are running.
Unexpected error. Check the "qbsdklog.txt" file for possible additional information.[After 3 attempts show] Connector unable to connect to QuickBooks. Please restart the computer hosting the QuickBooks web connector and try again.
This application is unable to log into this QuickBooks company data file automatically. The QuickBooks administrator must grant permission for an automatic login through the Integrated Application preferences. If such permission was already granted, the administrator must revoke permission, save preferences, then grant the permission again.Unable to connect to QuickBooks while it is closed. Please update the Integration Applications preferences to enable this.
A QuickBooks company data file is already open and it is different from the one requested or there are multiple company files open.A different company file than the one configured for this connection is open. Please close QuickBooks Desktop or open the correct company file.
This application is not allowed to log into this QuickBooks company data file automatically. The QuickBooks administrator can grant permission for an automatic login through the Integrated Application preferences.Unable to connect to QuickBooks while it is closed. Please update the Integration Applications preferences to enable this.
Quickbooks can't return sensitive information, if company file is not protected with a complex passwordQuickBooks can't return sensitive information. Please enable multi user mode and configure a password for the user the web connector logs in as.
An internal QuickBooks error occurred while trying to access the QuickBooks company data file.Connector unable to connect to QuickBooks. Please restart the computer hosting the QuickBooks web connector and try again.
Exception from HRESULT: 0x80040414Connector unable to connect to QuickBooks. Please restart the computer hosting the QuickBooks web connector and try again.
Recent changes to your configuration require you (the QuickBooks Administrator) to go into the Integrated Applications preferences and re-authorize your integrated application to log in automatically.QuickBooks Desktop requires a re-authorization of this connection. Please open QuickBooks Desktop with the correct company file, attempt to sync and approve the respective prompts.