ERROR_LOGIN_TIME_RESTRICTION - 1239 (0x4D7)
Attempting to log in during an unauthorized time of day for this account.
Updated: Feb 21, 2026
Technical Background
The ERROR_LOGIN_TIME_RESTRICTION error code indicates that an attempt to log in has been blocked due to time-based restrictions configured for the account. This is a permission-related issue, as it involves access control based on the current time of day.
Error Details
- Error Name: ERROR_LOGIN_TIME_RESTRICTION
- Numeric Code: 1239 (0x4D7)
- Short Description: Attempting to log in during an unauthorized time of day for this account.
This error typically occurs when a user tries to authenticate at a time that is not allowed by the system or policy settings. The restriction could be set through Group Policy, local security policies, or other administrative tools.
Common Causes
- Incorrect Time Settings: The system clock may be incorrectly configured, leading to unauthorized login attempts during restricted hours.
- Policy Configuration Errors: Misconfigured time-based restrictions in the security policy settings can lead to this error.
- Time Zone Mismatch: If the local time zone is not correctly set, it might cause a mismatch with the configured restriction times.
Real-World Context
This error is often encountered in environments where strict access control is necessary. For example, organizations may restrict login attempts during off-hours to prevent unauthorized access or reduce the risk of security breaches.
Is This Error Critical?
The severity of this error depends on the context and the importance of the account being accessed. Unauthorized access can lead to data breaches or other security issues, making it a critical concern in many scenarios.
How to Diagnose
- Review Operation Context: Check if the login attempt was made during restricted hours as defined by the system policies.
- Validate Parameters: Ensure that the account has not been configured with specific time-based restrictions.
- Confirm Object Types: Verify that the user is attempting a login operation and not another type of authentication or access request.
- Verify Input Data: Confirm that the system clock is correctly set to the current time zone and date.
How to Resolve
- Correct Parameter Usage: Ensure that all parameters related to time settings are correct, including the system clock and any configured policies.
- Adjust Operation Context: If necessary, adjust the login times allowed for the account or change the system's time settings to match the expected operation context.
- Restore Data: In cases where data corruption might have affected the time settings, restore the correct configuration.
- Retry Operation with Valid Inputs: Attempt the login again after ensuring that all inputs are valid and within the allowed parameters.
Developer Notes
Developers should be aware of potential security implications when implementing authentication mechanisms. Ensuring that time-based restrictions are correctly configured and validated can help prevent unauthorized access.
Related Errors
ERROR_ACCOUNT_RESTRICTION(1326)ERROR_LOGON_TIME(1312)ERROR_PASSWORD_EXPIRED(1904)
FAQ
Q: What does the ERROR_LOGIN_TIME_RESTRICTION error mean?
A: This error indicates that an unauthorized login attempt was made during a time when such attempts are restricted.
Q: How can I prevent this error from occurring?
A: Ensure that your system's clock is correctly set and that no time-based restrictions have been misconfigured in the security policies.
Q: Can this error be caused by incorrect time zone settings?
A: Yes, if the local time zone is not correctly configured, it can lead to a mismatch with the restricted login times.
Summary
The ERROR_LOGIN_TIME_RESTRICTION error code highlights an attempt to log in during unauthorized hours. This issue is typically resolved by ensuring that system clocks and security policies are correctly configured. Developers should be mindful of time-based restrictions when implementing authentication mechanisms to prevent such errors.