ERROR_INCOMPATIBLE_SERVICE_SID_TYPE - 1290 (0x50A)
The service start failed since one or more services in the same process have an incompatible service SID type setting. A service with restricted service SID type can only coexist in the same process with other services with a restricted SID type. If the service SID type for this service was just configured, the hosting process must be restarted in order to start this service. On Windows Server 2003 and Windows XP, an unrestricted service cannot coexist in the same process with other services. The service with the unrestricted service SID type must be moved to an owned process in order to start this service.
Updated: Feb 21, 2026
Technical Background
The ERROR_INCOMPATIBLE_SERVICE_SID_TYPE error indicates that a service failed to start because the service SID type setting is incompatible with other services in the same process. This error typically occurs on Windows Server 2003 and later versions, where specific restrictions apply regarding how services can coexist within a single process.
Error Details
The error code 1290 (0x50A) signifies that one or more services in the same process have an incompatible service SID type setting. A service with a restricted SID type cannot coexist in the same process with other services unless all services within the process are configured to use a restricted SID type.
Common Causes
- Incorrect Service SID Type Configuration: The service SID type was incorrectly set, leading to an incompatibility issue.
- Process Restructuring Required: A service with an unrestricted SID type is present in the same process as other services. To resolve this, the hosting process must be restarted or the service moved to a separate process.
Real-World Context
This error can occur when attempting to start a service that has been configured with a restricted SID type while another service within the same process has an unrestricted SID type. On Windows Server 2003 and earlier, such configurations are not allowed, necessitating a reconfiguration or restructuring of the services.
Is This Error Critical?
The criticality of this error depends on the specific scenario. If the service is essential for system operation, it may be necessary to address the issue promptly to ensure system stability and functionality.
How to Diagnose
- Review Service Configuration: Check the configuration settings of all services within the same process to identify any incompatible SID types.
- Verify Process Context: Ensure that the hosting process is correctly configured for the service type requirements.
- Check for Unrestricted Services: Identify if there are any services with an unrestricted SID type in the same process.
How to Resolve
- Correct Parameter Usage: Ensure all services within the process have compatible SID types. If necessary, adjust the configuration settings of the services.
- Adjust Operation Context: Restart the hosting process or move incompatible services to separate processes if required.
- Restore Data: In cases where data corruption is suspected, restore from a backup if available.
Developer Notes
When configuring services, ensure that all services within the same process have compatible SID types to avoid this error. This can be achieved by setting consistent service SID type configurations or by structuring the processes appropriately.
Related Errors
ERROR_SERVICE_DOES_NOT_EXISTERROR_SERVICE_START_NAME_COLLISIONERROR_SERVICE_MARKED_FOR_DELETE
FAQ
Q: What does the ERROR_INCOMPATIBLE_SERVICE_SID_TYPE error mean?
A: This error indicates that a service failed to start due to incompatible service SID type settings within the same process.
Q: How can I resolve this issue?
A: Ensure all services in the same process have compatible SID types. If necessary, restart the hosting process or move incompatible services to separate processes.
Summary
The ERROR_INCOMPATIBLE_SERVICE_SID_TYPE error is a specific technical issue related to service configuration and process management on Windows systems. Understanding its context and addressing it appropriately can help maintain system stability and functionality.