What is Windows Event ID 1022?

Windows Event ID 1022 is an entry in the Windows event log that signals a specific condition related to the .NET Data Collector and its associated applications. This event indicates that the .NET Data Collector has been either unregistered or uninstalled, but one or more .NET applications that were previously interacting with or being monitored by it have not yet been restarted.

Understanding Event ID 1022

The .NET Data Collector is a component often used for monitoring the performance and health of applications built on the Microsoft .NET framework. When this collector is removed or disabled, the system expects any dependent .NET applications to be restarted to ensure a clean state and proper functionality. Event ID 1022 serves as a notification that this expected restart has not occurred, potentially leaving the applications in an undefined state regarding their monitoring or data collection capabilities.

When Does Event ID 1022 Occur?

This particular event is generated under specific circumstances:

• Unregistration of .NET Data Collector: The .NET Data Collector component has been manually unregistered from the system.
• Uninstallation of .NET Data Collector: The .NET Data Collector software has been completely uninstalled.
• Pending Application Restart: After either of the above actions, one or more .NET applications that rely on or interact with the collector have not been restarted. This means these applications might still be attempting to communicate with a non-existent or unregistered collector.

Impact and Significance

While Event ID 1022 itself doesn't necessarily indicate a critical system failure, it highlights a configuration mismatch. For systems where application performance monitoring is crucial, this event can mean that monitoring data for specific .NET applications is no longer being collected effectively. It's an informational or warning event that prompts an administrative action to restore the system to a consistent state.

Troubleshooting and Resolution

The resolution for Event ID 1022 is straightforward and involves ensuring that all affected .NET applications are properly restarted. This action allows the applications to recognize the change in the .NET Data Collector's status and re-establish their operational parameters.

Practical Steps to Resolve Event ID 1022:

1. Identify Affected Applications: Although the event message might not explicitly list every affected application, the context often implies applications that were previously monitored by the .NET Data Collector. This could include web applications, services, or desktop applications running on the server.
2. Plan for Restart: Determine the appropriate time to restart the applications. For critical production systems, this might require a scheduled maintenance window.
3. Restart .NET Applications:
   • Web Applications: For web applications hosted on IIS (Internet Information Services), recycling the application pools or restarting the specific websites is usually sufficient. A full IIS restart (iisreset) can also be performed if multiple applications are involved, but be aware it will affect all sites hosted on that IIS instance.
   • Windows Services: If the .NET applications are running as Windows services, locate them in the Services console (services.msc) and restart each relevant service.
   • Desktop Applications: For desktop applications, simply closing and reopening the application will typically suffice.
4. Verify Resolution: After restarting the applications, check the Windows Event Log again (using Event Viewer) to confirm that Event ID 1022 is no longer being generated.

Event Details at a Glance

For quick reference, here’s a summary of common fields associated with Event ID 1022:

By addressing Event ID 1022 promptly, administrators can ensure the proper functioning and stability of their .NET applications and the underlying system.