How to Check Hosting Settings When QuickBooks Connection Is Lost
Incorrect hosting settings often cause QuickBooks to lose connection. Verify that only the server computer is hosting multi-user access. On each workstation, go to File > Utilities and confirm the correct hosting status. Multiple hosts can cause conflicts and disconnect users. Adjusting hosting settings properly ensures stable connection and seamless collaboration in QuickBooks.
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3 DIY Steps to Fix: QuickBooks Connection Has Been Lost Error - Small Business Community Article By Alastor Moody

Community Article posted by Alastor Moody on Small Biz.