| Event Id | 7021 |
| Source | Service Control Manager |
| Description | About to revert to the last known good configuration because the %1 service failed to start. |
| Event Information | According to Microsoft : Cause : A critical service or driver failed to start; therefore the system will revert to the last saved configuration. Resolution : Check the Event Log with Event Viewer for details about the service or driver errors that preceded this one. ------------------------------------------------------------------------------------------------------------------------------------------------------- Cause 1: This event is logged when critical service or driver failed to start. Resolution : Start the service manually To perform this procedure, you must have membership in Administrators, or you must have been delegated the appropriate authority. To start a service: 1.Open theServices snap-in by clicking theStart button, Control Panel, andAdministrative Tools, then double-clickingServices. Note: For Windows Vista, use theClassic View display option in Control Panel to see theAdministration Tools. 2.In the details pane of the Services snap-in, right-click on the name of the service you want to start and selectStart. Verify : To perform this procedure, you must have membership inAdministrators, or you must have been delegated the appropriate authority. To verify the state in which a service is operating: 1.Click theStart button, Run, then typecmd to open a command prompt. 2.Typesc interrogate service_name (where service_name is the name of the service) at the command prompt to update the status of that service in Service Control Manager. 3.Typesc qc service_name at the command prompt to display the configuration status of the service. 4.Typesc queryex service_name at the command prompt to display the extended status of the service. This command will provide the following information about a service: SERVICE_NAME (the service's registry subkey name), TYPE (the type of service, for example, shared process, interactive), STATE (for example, running, paused, and the states that are not available), WIN32_EXIT_CODE (the Windows exit error code), SERVICE_EXIT_CODE (the service exit code), CHECKPOINT, WAIT_HINT (the time period the SCM waits before reporting a service failure), PID (ID of the process running the service), and FLAGS. If the service was started successfully, the WIN32_EXIT_CODE field should contain a zero (0). If the service failed to start when an attempt was made, this field should contain an exit code provided by the service when it could not start. 5.Type net helpmsg exit_code (where exit_code is the 4 digit number of the error code) at the command prompt to display the meaning of the exit code. |
| Reference Links | Event ID 7021 from Source Service Control Manager Critical service or driver failed to start |
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