Customer got this error.

QuickBooks is unable to open this company file. It may have been opened by another user.

quickbooks_error

We had all the users log out, but the single user trying to get was getting the error.

What I did to fix it was to log onto the server, run services, and restarted all the quickbook services.

  • QuickBooksDB22
  • QuickBooksDB25
  • QBCFMonitorService – This service was not running though set to start automatically. Starting this service got it working correctly.

quickbooks_service

I hope this helps someone else out there…