Windows Error Code 0x80080021
The error code 0x80080021 is an HRESULT code that occurs in Windows environments 10 and Windows 11, indicating that a class COM (Component Object Model)The Component Object Model (COM, by its acronym in English) is a Microsoft technology that allows communication between software components in different programming languages and platforms. Introduced in the years 90, COM makes it easy to create modular applications, where components can be reused in different contexts. Use unique identifiers (GUID) to identify components and their interfaces, ensuring interoperability. Although it has been in.... More is configured to run with a security identifier (SID)The Security Identifier (SID) is a unique code used in Windows operating systems to specifically identify users, security groups and objects. This identifier is essential for permissions and access management, since it allows the system to determine what actions each entity can perform. SIDs are generated by the system and are not reusable, thus guaranteeing integrity and security in the administration.. different one than the caller's. This error is directly related to the subsystem COMThe Component Object Model (COM, by its acronym in English) is a Microsoft technology that allows communication between software components in different programming languages and platforms. Introduced in the years 90, COM makes it easy to create modular applications, where components can be reused in different contexts. Use unique identifiers (GUID) to identify components and their interfaces, ensuring interoperability. Although it has been in.... More Windows, a fundamental mechanism for communication between software components, como interfaces de programación de aplicaciones (APIs) y servicios del sistema. Su importancia radica en que puede interrumpir operaciones críticas, como las actualizaciones de Windows, application installation and the execution of services that depend on COM, lo que podría comprometer la integridad y el rendimiento del sistema. Como código HRESULT, forma parte de la familia de errores 0x8008xxxx, asociados a problemas de interfaces COM, y es especialmente relevante para administradores de sistemas y desarrolladores que trabajan con componentes distribuidos o servicios de Windows.
Introducción
El error 0x80080021 ha ganado prominencia en Windows 10 and Windows 11 debido al creciente uso de COM en escenarios modernos, como la gestión de actualizaciones, the task automationTask automation refers to the use of technology to carry out activities that, traditionally, required human intervention. This practice allows you to optimize processes, reduce errors and increase efficiency in various industries. From email management to inventory management, Automation offers solutions that improve productivity and free up time for employees to focus on more strategic tasks. As the tools of.... y la integración de aplicaciones. COM, introducido inicialmente en Windows NT 3.1, it is a Microsoft standard for creating reusable software components that allow interaction between processes and applications. In the context of Windows 10 Y 11, this error usually appears during processes involving the initialization of COM objects, such as when running CoCreateInstance or accessing interfaces defined in .idl files.
In Windows 10, where the modular architecture (with features like Windows Subsystem for Linux S Mode) increases complexity, error 0x80080021 can arise in common scenarios such as failures in Windows UpdateWindows updates are essential components for the maintenance and security of Microsoft operating systems. Through Windows Update, users receive performance improvements, security patches and new features. It is recommended that users keep this option activated to ensure protection against vulnerabilities and optimize system operation. Updates are downloaded and installed automatically, although it is also possible to configure them manually.., issues with services like BITS (Background Intelligent Transfer ServiceEl Servicio de Transferencia Inteligente en Segundo Plano (BITS, by its acronym in English) es una tecnología de Microsoft diseñada para optimizar la transferencia de datos en sistemas operativos Windows. BITS permite que las aplicaciones realicen descargas o cargas de archivos en segundo plano, utilizando el ancho de banda de manera eficiente y minimizando el impacto en el rendimiento del sistema. Esta herramienta es especialmente útil para actualizaciones de software...) or conflicts in applications that use COM for authentication. For example, when trying to install an update, the system could report this error if the caller's security context does not match the SID configured in the relevant COM class. In Windows 11, with security improvements (such as TPM integration and Windows Hello-based authentication), this error has become more frequent in corporate environments, where group policies or configurations Active DirectoryActive Directory (AD) is a directory service developed by Microsoft that allows you to manage and organize resources within a network. Facilitates authentication and authorization of users and computers, offering a framework for centralized management of security and access policies. AD uses a hierarchical structure that includes domains, trees and forests, providing efficient scalability. What's more, allows the implementation of Group Policies, that help.... alter security contexts.
The relevance of this error for advanced users lies in its ability to expose underlying issues in system configuration, such as improper permissions or registry corruption. System administrators might encounter it when debugging failures in scripts PowerShellPowerShell is a configuration management and automation tool developed by Microsoft.. Allows system administrators and developers to run commands and scripts to perform administration tasks on Windows operating systems and other environments. Its object-based syntax makes data manipulation easy, making it a powerful option for systems management. What's more, PowerShell has an extensive library of cmdlets, So... or when configuring remote services, while developers face it when creating applications that interact with COM APIs. understanding 0x80080021 is essential for maintaining system stability, ya que su aparición puede indicar vulnerabilidades en la cadena de confianza de COM, potencialmente exponiendo el sistema a riesgos de seguridad si no se resuelve adecuadamente.
Detalles Técnicos
El código de error 0x80080021 es un valor HRESULT, un tipo de dato de 32 bits used in Windows to report the success or failure of operations, especialmente en APIs COM y OLE (Object Linking and Embedding). The structure of an HRESULT is composed of several fields: el bit más significativo indica la severidad (0 para éxito, 1 para error), seguido de un bit de cliente (que especifica si es un código de error personalizado), el código de instalación (facility code) and the specific error code.
Desglosemos 0x80080021:
- Severidad: El bit alto está establecido (0x8), lo que indica un error grave que requiere atención inmediata.
- Código de cliente: Establecido (bit 29), sugiriendo que es un error definido por el cliente o por una aplicación, en lugar de un código del sistema base.
- Facility code: 0x08 (decimal value 8), que corresponde a FACILITY_ITF (Interface), un código reservado para errores relacionados con interfaces COM, como problemas en la activación de objetos o en la resolución de clases.
- Specific error code: 0x0021 (decimal 33), que se interpreta como "CO_E_SID_MISMATCH" in Microsoft documentation, significando que la clase COM está configurada para ejecutarse bajo un SID diferente al del proceso llamador.
Este error afecta APIs clave como CoCreateInstance, CoGetClassObject Y CoInitializeSecurity, que son esenciales para la inicialización y el uso de objetos COM. In terms of system processes, involucra componentes como el servicio RPC (Remote Procedure Call) y el motor de COM, que dependen de la biblioteca ole32.dll. For example, si una aplicación intenta crear una instancia de una clase COM registrada en el registro (bajo HKEY_CLASSES_ROOTCLSID), pero el SID del llamador no coincide con el especificado en la clave "AppID" o en las configuraciones de seguridad, se genera 0x80080021.
In Windows 10 Y 11, este error puede involucrar dependencias adicionales, como el Servicio de Configuración de Windows (Winmgmt) para componentes WMI (Windows Management Instrumentation) o el Subsistema de Actualización de Windows, que utiliza COM para manejar descargas. Las especificaciones técnicas, según la documentación del SDKA Software Development Kit (SDK) is a set of tools and resources that allow developers to create applications for a specific platform. Usually, an SDK includes libraries, documentation, code examples and debugging tools. Its goal is to simplify the development process by providing reusable components and facilitating the integration of functionality.. SDKs are essential in modern software development, since they allow.... More Windows, detallan que el error se produce cuando la función CoCreateInstance falla debido a un contexto de seguridad incompatible, lo que podría involucrar verificaciones en el Registro de Windows o en configuration filesConfiguration files are essential components in the field of computing, used to customize the behavior of software and operating systems. These files, which usually have extensions like .ini, ..conf or .json, store parameters and settings that allow adapting the operation of an application to the user's needs. By allowing configuration changes without modifying the source code, configuration files promote a... de COM como comcat.dll.
For a deeper understanding, los usuarios avanzados pueden consultar el encabezado winerror.h del SDK de Windows, donde se definen constantes como HRESULT_FROM_WIN32(ERROR_SID_MISMATCH). En entornos de desarrollo, herramientas como OleView.exe (de la SDK de Windows) permiten inspeccionar las configuraciones de COM y depurar problemas relacionados con este error.
Causas Comunes
El error 0x80080021 surge de varias condiciones específicas que afectan la integridad de COM y los contextos de seguridad en Windows. Then, the most frequent causes are detailed, con ejemplos para ilustrar su impacto:
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Desajuste en identificadores de seguridad (SID): La causa principal es cuando una clase COM está configurada para ejecutarse bajo un SID específico (for example, un cuenta de servicio local), pero el proceso llamador opera bajo un SID diferente. Esto ocurre comúnmente en entornos con políticas de grupo activas, como en dominios de Active Directory. For example, si un script de PowerShell intenta acceder a un objeto COM registrado para un SID de administrador, pero se ejecuta como un usuario estándar, the error occurs.
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Corrupción en el registro de Windows: Entradas corruptas o mal configuradas en claves como HKEY_CLASSES_ROOTCLSID o HKEY_LOCAL_MACHINESOFTWAREClassesAppID pueden causar este error. Un ejemplo típico es después de una instalación fallida de software que registra componentes COM incorrectamente, lo que lleva a referencias inválidas o permisos insuficientes en el registro.
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Conflictos con software de terceros: Antivirus applications, firewalls o herramientas de virtualización pueden interferir con los procesos COM, alterando los contextos de seguridad. For instance, un firewall que bloquea el puerto RPC (135) podría prevenir la resolución adecuada de clases COM, resultando en 0x80080021 durante operaciones de red.
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Permission and user account issues: Si el usuario actual no tiene los permisos necesarios para acceder a objetos COM, o si hay un fallo en la inicialización de seguridad con CoInitializeSecurity, the error occurs. Esto es común en escenarios de elevación de privilegios, como cuando se ejecuta un comando con "Ejecutar como administrador" pero el SID no coincide.
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System file corruption or pending updates: Archivos DLLA Dynamic Link Library (DLL, by its acronym in English) is a file that contains code and data that can be used by multiple programs simultaneously on an operating system. Its main advantage is code reuse, which optimizes the use of resources and reduces the size of applications. DLLs allow different programs to share functionality, as common functions or graphical resources, without the need for.... More related to COM, such as ole32.dll or rpcrt4.dll, they could be damaged due to failed updates or malware infections. In Windows 11, with its focus on cumulative updates, a partial update could leave COM components in an inconsistent state.
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UAC settings (User Account Control) non-standard: In Windows 10 Y 11, if UAC is set to a high level, it can create mismatches in security tokens, exacerbating the error during the execution of applications that require elevation.
These causes are not mutually exclusive and often combine, requiring a thorough diagnosis to identify the precise source.
Pasos de Resolución
Resolving error 0x80080021 requires a systematic approach, utilizando herramientas de command lineThe command line is a textual interface that allows users to interact with the operating system using written commands.. Unlike graphical interfaces, where icons and menus are used, The command line provides direct and efficient access to various system functions. It is widely used by developers and system administrators to perform tasks such as file management, network configuration and.... and registry edits. The following steps are designed for advanced users, como administradores de sistemas y desarrolladores. Warning: These procedures involve risks, such as system corruption if registries are edited incorrectly. Siempre realice copias de seguridad y ejecute comandos en un entorno de prueba antes de aplicarlos en producción.
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Check and repair system files with SFC: Run the SFC command to scan and repair corrupt system files. Open an elevated command prompt and run:
sfc /scannowThis will scan Windows protected files and replace any damaged files. If SFC detects problems but cannot repair them, proceed to the next step.
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Usar DISM para restaurar la imagen del sistema: If SFC does not resolve the issue, utilice DISM para reparar la imagen del sistema. En un símbolo del sistema elevado:
DISM /Online /Cleanup-Image /RestoreHealthThis command downloads healthy components from Windows Update. Later, run again
sfc /scannowpara verificar. -
Reregister COM components: Many COM errors are resolved by reregistering DLLs. Use regsvr32 for common components:
regsvr32 ole32.dll regsvr32 rpcrt4.dllFor a more comprehensive approach, create a PowerShell script:
$comDlls = @("ole32.dll", "rpcrt4.dll", "comcat.dll") foreach ($dll in $comDlls) { regsvr32 /s $dll }Run this in a PowerShell console with elevated privileges.
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Edit the registry to check COM settings: Use the Editor del RegistroThe "Registry Editor" es una herramienta fundamental en sistemas operativos como Windows, que permite a los usuarios modificar la base de datos del registro. Esta base de datos almacena configuraciones esenciales del sistema y de aplicaciones, and editing it can help optimize system performance or resolve functional issues. However, it is important to use this tool with caution, since incorrect changes can cause system failures.... (regedit.exe) to inspect and fix keys. Navegue a HKEY_CLASSES_ROOTCLSID and look for entries with incorrectly configured AppIDs. For example, make sure subkeys have proper permissions:
- Export the key before editing.
- Add permissions for the current user's SID if necessary.
Recommended practice: Use tools like subinacl.exe to manage permissions in the registry.
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Debug with COM tools: Run OleView.exe from the Windows SDK to inspect COM classes. Look for classes with mismatched SIDs and resolve manually. What's more, check the event logThe "Event logging" It is a fundamental tool in systems and processes management, that allows documenting, monitor and analyze specific activities within an organization. This record provides detailed information about actions, errors and changes in the system, facilitating patterns identification and problem solving. What's more, It is essential for regulatory compliance and audit, since it guarantees the traceability of operations. Implement a ... (Event Viewer) para entradas relacionadas con COM.
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Restart related services: En Servicios (services.msc), reinicie servicios como "Servicios de componentes COM+ (COM+ Event System)" y "Servidor de procedimientos remotos (RPC)".
After each step, pruebe el escenario que generó el error para verificar la resolución. If it persists, considere una system restoreThe "System restore" It is a function integrated into operating systems that allows you to revert the state of the computer to a previous point in time. This tool is useful for troubleshooting issues caused by recent changes, such as installing software or drivers that affect device performance. When performing a restore, changes made after the selected point are deleted, but personal files remain intact. Es... o una reinstalación de Windows.
Related Errors
El error 0x80080021 forma parte de la familia de errores HRESULT relacionados con COM (0x8008xxxx). Then, A table with related errors is presented, Their descriptions and connections:
| Código de Error | Description | Conexión con 0x80080021 |
|---|---|---|
| 0x80080005El código de error 0x80080005 es un problema común en sistemas Windows, relacionado con el modelo de objetos componentes (COM). Suele indicar fallos en el registro de componentes o permisos insuficientes. It can occur when installing software or updating the system. To fix it, check user permissions, restart the affected services and consult Microsoft’s official documentation. (58 palabras)... | CO_E_SERVER_EXEC_FAILURE | Indica fracaso en la ejecución del servidor COM, a menudo debido a problemas de seguridad similares, como permisos insuficientes. |
| 0x80070005El error **0x80070005** es un problema común en sistemas Windows, generalmente relacionado con permisos insuficientes o problemas de acceso a archivos. Este código de error puede aparecer al intentar actualizar el sistema, instalar software o realizar copias de seguridad. Las causas incluyen configuraciones de seguridad restrictivas o corrupción de datos. Para solucionarlo, se recomienda ejecutar el programa como administrador, verificar los permisos de las carpetas involucradas o utilizar herramientas de... | E_ACCESSDENIED | General access denied error, which could precede or follow 0x80080021 in permission scenarios. |
| 0x80080001 | CO_E_CLASSSTRING | Related to invalid COM class strings, which can contribute to SID mismatches. |
| 0x80070424 | ERROR_SERVICE_NOT_FOUND | Occurs when a COM service is not found, possibly linked to corrupted configurations that also cause 0x80080021. |
| 0x80072EE7 | WININET_E_TIMEOUT | En contextos de Windows Update, indicates timeouts, which could be associated with COM errors in transfers. |
These errors share common patterns in the 0x8007xxxx family (Windows Update) and 0x8008xxxx (COM), highlighting integration issues between system components.
Historical Context
The 0x80080021 error has its roots in the evolution of COM, introduced in Windows NT 3.1 in the early decade of 1990. Initially, COM focused on component reuse, but with Windows 2000 and XP, it integrated more deeply with system services, which introduced security-related errors. In Windows 7, 0x80080021 started to appear more frequently due to improvements in UAC, which emphasized SID verification.
In Windows 10 (launched in 2015), Microsoft refined COM for modern environments, incorporating features like COM in isolated processes, which made errors like 0x80080021 more common in virtualization and update scenarios. For example, updates like KB4056892 in Windows 10 fixed issues related to COM, reducing incidents.
Windows 11, with its focus on security (for example, with Windows DefenderWindows Defender is a security tool built into the Windows operating system, designed to protect users against viruses, malware and other online threats. Offers features such as real-time analysis, Cloud-based protection and automatic updates to ensure continued device security. What's more, its interface is intuitive, making it easy to use even for those who are not tech savvy. With the increase.... and TPM), have exacerbated this error in corporate configurations, where group policies affect SIDs. Parches recientes, like those in the October update 2023, have addressed COM vulnerabilities that could cause 0x80080021. Históricamente, Microsoft has evolved COM into DCOM (Distributed COM) in Windows Vista, which amplified the need for security verification, causing this error to persist to this day.
References and Further Reading
- Microsoft Learn: System Error Codes – A comprehensive guide on HRESULT and Windows errors.
- Windows SDK documentation – Includes details on COM and tools like OleView.
- Microsoft Community Forum – Technical discussions on COM errors in Windows 10 Y 11.
- Microsoft Docs: HRESULT – Detailed analysis of the structure of HRESULT and facility codes.
- TechNet: Managing COM in Windows – Resources for administrators on configuring and troubleshooting COM.
These resources provide a solid foundation for deeper research, ensuring that users progress with precise and up-to-date knowledge.



