ERROR_LOG_BLOCK_INVALID - 6609 (0x19D1)
Log service encountered an invalid log block.
Updated: Feb 21, 2026
Technical Meaning
The ERROR_LOG_BLOCK_INVALID error code (6609 or 0x19D1) indicates that the log service encountered an invalid log block. This typically suggests a problem with the structure, content, or format of a log entry.
Error Details
This error is returned when the logging subsystem detects a malformed or improperly formatted log block. The log block may contain incorrect data types, be corrupted, or fail to meet certain validation criteria required by the logging mechanism.
Usage Context
The ERROR_LOG_BLOCK_INVALID can occur in various scenarios where log entries are being processed or written. This includes both system logs and application-specific logging mechanisms that rely on structured log blocks for recording events.
Developer Interpretation
When encountering this error, developers should consider the following:
- Log Block Structure: Ensure that all fields within a log block adhere to the expected format and data types.
- Data Integrity: Verify that the log entries are not corrupted or tampered with during transmission or storage.
- Parameter Validation: Check for any invalid parameters passed to logging functions, which could lead to malformed log blocks.
Related Errors
ERROR_INVALID_DATA(0x13A): Indicates an invalid data format in a non-log context.ERROR_LOG_FILE_FULL(0x2F8): Occurs when the log file reaches its maximum size and cannot accept new entries.ERROR_LOG_BLOCK_TRUNCATED(0x2F9): Suggests that a log block was truncated or incomplete during writing.
FAQ
Q: What does ERROR_LOG_BLOCK_INVALID mean?
A: It indicates an issue with the structure or content of a log block in the logging subsystem.
Q: How can I troubleshoot this error?
A: Review the log entries and ensure they are correctly formatted. Check for any invalid parameters passed to logging functions.
Summary
The ERROR_LOG_BLOCK_INVALID error code (6609 or 0x19D1) is a generic indication that the logging subsystem encountered an issue with a log block's structure or content. Developers should focus on validating log entries and ensuring they meet the expected format to resolve this error.