ERROR_NO_SUCH_LOGON_SESSION - 1312 (0x520)
A specified logon session does not exist. It may already have been terminated.
Updated: Feb 21, 2026
Technical Meaning
The error code ERROR_NO_SUCH_LOGON_SESSION with the numeric value 1312 and hexadecimal representation 0x520 indicates that a specified logon session does not exist. This typically means that the session has already been terminated or was never established in the first place.
Error Details
This error is commonly encountered when an application attempts to access resources associated with a specific user logon session, but the session cannot be found. The absence of such a session can occur due to various reasons, including incorrect session identifiers, invalid parameters, or issues related to authentication and authorization mechanisms.
Usage Context
This error is relevant in scenarios where applications require authenticated access to resources on a Windows system. It may arise when performing operations that depend on an active logon session, such as accessing user-specific data or executing tasks under the context of a particular user account.
Developer Interpretation
When encountering ERROR_NO_SUCH_LOGON_SESSION, developers should consider several aspects:
- Session Validity: Verify that the logon session identifier is correct and valid. Ensure that the session has not been terminated prematurely or does not exist in the first place.
- Authentication Context: Confirm that the application has the necessary credentials to establish a valid logon session. Issues with authentication mechanisms can lead to such errors.
- Session Management: Check if there are any issues related to session management, including session timeouts and termination policies.
Related Errors
ERROR_LOGON_SESSION_COLLISION(1309): Indicates that the system is unable to establish a logon session due to conflicts with existing sessions.ERROR_INVALID_PARAMETER(120) orERROR_BAD_ARGUMENTS(171): These errors may indicate incorrect parameters passed during logon session operations, which could lead toERROR_NO_SUCH_LOGON_SESSION.
FAQ
Q: What does the error code 1312 mean?
A: The error code 1312 signifies that a specified logon session does not exist. It may have already been terminated or was never established in the first place.
Q: How can I resolve this issue?
A: Ensure that the logon session identifier is correct and valid, verify authentication credentials, and check for any issues related to session management policies.
Summary
ERROR_NO_SUCH_LOGON_SESSION (1312) indicates a non-existent or terminated logon session. Developers should focus on verifying session identifiers, ensuring proper authentication, and managing sessions according to system policies to avoid this error.