ERROR_GUID_SUBSTITUTION_MADE - 680 (0x2A8)
{GUID Substitution} During the translation of a global identifier (GUID) to a Windows security ID (SID), no administratively-defined GUID prefix was found. A substitute prefix was used, which will not compromise system security. However, this may provide a more restrictive access than intended.
Updated: Feb 21, 2026
Technical Meaning
During the translation of a global identifier (GUID) to a Windows security ID (SID), no administratively-defined GUID prefix was found. A substitute prefix was used, which will not compromise system security but may provide more restrictive access than intended.
Error Details
This error indicates that during an operation involving the conversion of a GUID to a SID, the system could not find a valid administrative prefix for the provided GUID. As a result, it substituted a default or generic prefix to proceed with the operation. This substitution ensures that the security context remains intact and does not introduce vulnerabilities.
Usage Context
This error can occur in various scenarios where operations require the conversion of GUIDs to SIDs, such as during user or group management, file system operations, or other administrative tasks involving security contexts.
Developer Interpretation
Developers should be aware that this error might indicate a potential mismatch between expected and actual GUID prefixes. While the operation will proceed with a default prefix, it is advisable to ensure that the correct administrative prefix is used for security and access control purposes.
Related Errors
- ERROR_NO_SUCH_USER (1326)
- ERROR_INVALID_SID (1300)
- ERROR_INVALID_PARAMETER (1400)
FAQ
Q: What does this error mean?
A: This error indicates that a GUID to SID translation could not find an administratively-defined prefix, and a substitute was used.
Q: Is the system secure after this error occurs?
A: Yes, the substitution ensures security is maintained, but it may result in more restrictive access than intended.
Q: How can I prevent this error?
A: Ensure that all GUIDs used are correctly prefixed and match the expected administrative definitions.
Summary
The ERROR_GUID_SUBSTITUTION_MADE error occurs when a GUID to SID translation uses a substitute prefix. This ensures security but may result in more restrictive access than intended. Developers should verify GUID prefixes for accurate security contexts.