What does Windows error code 15300 (ERROR_HASH_NOT_SUPPORTED) mean?

ERROR_HASH_NOT_SUPPORTED

Hash generation for the specified hash version and hash type is not enabled on the server.

ERROR_HASH_NOT_SUPPORTED is Windows system result 15300 (0x00003BC4). Microsoft defines it as “Hash generation for the specified hash version and hash type is not enabled on the server.”

How to classify the result

This result represents a server capability or policy rejection for hash generation. The correct interpretation depends on the server feature, protocol request, hash version, and hash type selected by the client.

Where it can appear

• This result can appear in a client requesting server-generated content metadata.
• This result can appear in a distributed cache or file service negotiating hash capabilities.
• It can appear in a management or protocol layer mapping a server hash response to Win32.

Typical causes

• the requested hash version is disabled by policy.
• the server build does not implement the requested type.
• client and server capability negotiation is stale.
• a feature that supplies hashes is not installed or enabled.
• the request encodes the version or type incorrectly.

Useful evidence

• Record server identity and build.
• Record hash version and type.
• Record capability negotiation response.
• Record feature and policy configuration.
• Record request correlation ID and native server status.

Recovery and retry

Enable the required supported hash capability or negotiate an allowed version and type that both endpoints implement.

Do not retry the unsupported combination. Retry only after capability or policy changes, or after selecting a negotiated alternative.

Difference from related results

ERROR_HASH_NOT_PRESENT says the requested hash is unavailable or stale; it says the requested generation method is not enabled.

Example

A client hard-codes a newer hash version against an older server. Capability negotiation selects the older supported type, while policy logs preserve the reason the original request was rejected.

Developer and administrator guidance

Protocol clients should negotiate algorithms and avoid silent downgrade when security requirements forbid it. Administrators should document enabled hash capabilities during server upgrades.

References

• Microsoft: System Error Codes 12000–15999
• Microsoft Open Specifications: Win32 error values
• Microsoft: BranchCache overview