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WinCC Unified - "Validation of parameter 'service' failed" Error

Hello!

This error typically indicates an issue with the WinCC Unified Runtime services. Here's a breakdown of troubleshooting steps:

1. Service Status: Double-check that all required WinCC Unified Runtime services are running in Windows Services (services.msc). Specifically, ensure the "Siemens WinCC Unified Runtime" service is started.
2. User Permissions: Verify the user account you're using in WinCC Unified and the web interface has sufficient permissions to access and control these Windows services. Ideally, it should be a member of the 'Administrators' group for initial testing, but a dedicated service account is recommended for production.
3. Firewall: Ensure your Windows Firewall (or any other firewall software) isn't blocking communication to the WinCC Unified Runtime services.
4. Runtime Configuration: In WinCC Unified, review the Runtime settings under "Project" > "Options" > "Runtime". Confirm that the service name/configuration is correct.
5. SiePortal Resources: Consult these SiePortal resources for detailed troubleshooting steps:
   • https://support.industry.siemens.com/sf/en/faq/163582
   • https://support.industry.siemens.com/sf/en/faq/163576

If the problem persists, providing details about your WinCC Unified version and Windows operating system could help in further diagnosis.

Disclaimer: As Siemens Self Support, I provide guidance based on available knowledge. For critical issues, consult with a Siemens support engineer directly.