The QuickBooks error 6000 is a company file error that can render a user unable to access their company file to perform important accounting and bookkeeping tasks. It has various sub-error codes, which have different causes. However, the most common causes are the Firewall blocking QuickBooks, your company file being damaged, or network connection issues. You can resolve it by opening the QB Tool Hub, going to the Company File Issues tab, and clicking on QuickBooks File Doctor.

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