Knowledge

RPC_S_SEC_PKG_ERROR - 1825 (0x721)

A security package specific error occurred.

Updated: Feb 21, 2026

Technical Background

The RPC_S_SEC_PKG_ERROR error code, with a numeric value of 1825 (0x721), indicates that a specific security package encountered an issue during its operation. This error is part of the Remote Procedure Call (RPC) framework and relates to authentication or authorization mechanisms.

Error Details

The RPC_S_SEC_PKG_ERROR code is a generic reference indicating that a security-related problem has occurred within a particular security package. Security packages in Windows are responsible for handling various aspects of user authentication, such as Kerberos, NTLM, or other custom implementations.

Common Causes

  • Unsupported Operations: The operation being performed may not be supported by the current security package configuration.
  • Incorrect Usage Context: The context in which the RPC call is made might be invalid for the security package involved.
  • Configuration Issues: Misconfiguration of the security package or related services could lead to this error.

    Real-World Context

    This error can occur when an RPC client attempts to authenticate using a specific security package, and that package fails due to internal issues. For example, if Kerberos is configured but not functioning correctly, this error might be returned.

    Is This Error Critical?

    The criticality of RPC_S_SEC_PKG_ERROR depends on the context in which it occurs. If authentication or authorization is failing, it can impact the overall security and functionality of the system.

    How to Diagnose

    1. Review Operation Context: Ensure that the RPC call is being made under the correct conditions and with valid parameters.
    2. Validate Parameters: Check if any input parameters are invalid or misconfigured.
    3. Confirm Object Types: Verify that the security package expected by the operation is correctly configured and available.
    4. Verify Input Data: Ensure that all data passed to the RPC call is correct and not corrupted.
    5. Check Limits or Constraints: Confirm that no system limits have been exceeded, such as maximum number of concurrent connections.

      How to Resolve

  • Correct Parameter Usage: Ensure that all parameters are correctly specified according to the security package requirements.
  • Adjust Operation Context: Modify the context in which the RPC call is made if necessary.
  • Restore Data: If data corruption is suspected, restore or repair the affected files or configurations.
  • Retry Operation with Valid Inputs: Attempt the operation again with valid inputs and ensure that all prerequisites are met.

    Developer Notes

    Developers should be aware of the specific security packages used in their applications and ensure they are correctly configured. Regularly updating and maintaining these packages can help prevent such errors.

    Related Errors

  • RPC_S_ACCESS_DENIED: Authentication failed due to insufficient permissions.
  • RPC_S_INVALID_AUTH_IDENTITY: Invalid authentication identity was provided.
  • RPC_S_NO_CONTEXT_AVAILABLE: No security context is available for the operation.

    FAQ

    Q: What does RPC_S_SEC_PKG_ERROR mean?

    A: It indicates a specific error within a security package during an RPC call, usually related to authentication or authorization issues.

    Q: How can I troubleshoot this error?

    A: Review the context of the RPC call, validate parameters, and ensure that all prerequisites are met. Consult the documentation for the specific security package involved.

    Summary

    The RPC_S_SEC_PKG_ERROR error code is a generic reference to a security-related issue within an RPC operation. Understanding its context and causes can help in diagnosing and resolving issues related to authentication or authorization mechanisms in Windows systems.