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When Windows Firewall is Blocking QuickBooks error occurs, it indicates that Windows' built-in security protection is preventing QuickBooks from connecting to the local network or the internet. This may make it more difficult for QuickBooks to run in multi-user mode, synchronize data, and perform updates. In order to fix this problem and make sure QuickBooks can make the required connections while preserving system security, you might need to adjust the Windows Firewall's settings to permit it. For instant assistance contact to our QuickBooks Experts Team at 1.855.738.2784.