QuickBooks Payroll Error 20102 can occur due to various reasons, such as issues with the internet connection, outdated QuickBooks or Payroll software, or incorrect system settings. Here are a few troubleshooting steps you can try to resolve the error:

Verify your internet connection: Ensure that your internet connection is stable and working properly. If your internet connection is weak or intermittent, this can cause the error.

Update QuickBooks and Payroll software: Make sure you have the latest version of QuickBooks and Payroll software installed. If not, update to the latest version and try again.

Clear temporary files and cache: Clear temporary files and cache on your computer to ensure that there are no issues with system settings.

Check the firewall settings: Ensure that your firewall settings are configured correctly to allow QuickBooks and Payroll software to communicate with each other.

Disable antivirus software: Try temporarily disabling your antivirus software as it can sometimes block the communication between QuickBooks and Payroll.

Run QuickBooks and Payroll in compatibility mode: If you are using an older version of Windows, try running QuickBooks and Payroll in compatibility mode.

Contact QuickBooks support: If none of the above steps work, contact QuickBooks support for further assistance. They can provide you with additional troubleshooting steps and help you resolve the error.

These steps should help you troubleshoot QuickBooks Payroll Error 20102.

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Peter