How to Fix QuickBooks Cannot Communicate With the Company File Due to the Firewall The frequent error QuickBooks Cannot Communicate With the Company File Due to the Firewall happens when QuickBooks is unable to access data due to network problems, improper hosting settings, or corrupted business files. Until the connection issue is fixed, it frequently affects multi-user mode and interferes with workflow. For professional advice and assistance with QuickBooks, give 1.855.738.2784 a call. URL: https://www.apsense.com/article/874223-a-guide-quickbooks-cannot-communicate-with-the-company-file-due.html