If you are getting QuickBooks error 6123 with error message Problem Connecting to Server or We’re Sorry, but QuickBooks can’t open your company file, then you will need to run QuickBooks File Doctor to repair the damage in the company file and Quick Fix My Program tool to re-register the QuickBooks installation files. If you need help from a certified QuickBooks expert to implement the troubleshooting steps, then dial 1.855.738.2784 and get in touch with the QuickBooks Desktop support team now.