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QuickBooks Error 557 occurs when the program encounters a conflict with certain security software or firewall settings while trying to connect to the internet. It may also be caused by incomplete or corrupted installation files. To resolve the issue, ensure that QuickBooks has access through your firewall and security software by adding exceptions for QuickBooks and QBCFMonitorService. You can also try running QuickBooks as an administrator or disabling the firewall temporarily to check if it's causing the issue. If the problem continues, reinstalling QuickBooks may help clear any damaged files or settings causing the error