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Event ID 2299 — IIS Application Pool Availability

  • Article

Applies To: Windows Server 2008 R2

Web sites and Web applications depend on the availability of Internet Information Services (IIS) application pools. IIS application pools in turn depend on the Windows Process Activation Service (WAS). If WAS is not running or errors occur during the startup or shutdown of an application pool, Web sites and Web applications may not be available.

Event Details

Product: Internet Information Services
ID: 2299
Source: Microsoft-Windows-IIS-W3SVC-WP
Version: 7.5
Symbolic Name: W3_EVENT_WORKER_PROCESS_UNHEALTHY
Message: An application has reported as being unhealthy. The worker process will now request a recycle. Reason given: %1. The data is the error.

Resolve

Debug the application and restart the application pool

To recover an application pool that has been disabled, follow these steps:

  • Correct any problems in the application that was running in the worker process. The application may have to be debugged and retested.
  • Restart the application pool.

To perform this procedure, you must have membership in Administrators, or you must have been delegated the appropriate authority.

To restart the application pool:

  1. Click Start, click Control Panel, and then click Administrative Tools.
  2. Right-click Internet Information Services (IIS) Manager and select Run as administrator.
  3. In the Connections pane, expand the computer node for the Web server and select the Application Pools folder underneath it.
  4. In Features View, select the application pool you want to restart.
  5. Right-click the application pool and select Start.

Verify

To perform this procedure, you must have membership in Administrators, or you must have been delegated the appropriate authority.

To verify that an application pool has started:

  1. Click Start, click Control Panel, and then click Administrative Tools.
  2. Right-click Internet Information Services (IIS) Manager and select Run as administrator.
  3. In the Connections pane, expand the server node and select Application Pools.
  4. In Features View, the Status column for the application pool will indicate Started if the application pool has started.

IIS Application Pool Availability

Internet Information Services (IIS) 7.5