QuickBooks Payroll service connection error typically occurs when the software can't communicate with Intuit's servers, often due to internet issues, outdated software, or firewall restrictions. To resolve it, check your internet connection, update QuickBooks, and verify firewall/antivirus settings aren't blocking payroll services. For persistent errors, run the Payroll Diagnostic Tool. Need payroll running ASAP? Our QuickBooks experts fix connection errors daily—contact us now at 855-888-3080