What does Windows error code 1751 (EPT_S_INVALID_ENTRY) mean?

EPT_S_INVALID_ENTRY

The endpoint map stores interface-to-address information

EPT_S_INVALID_ENTRY belongs to the endpoint mapper, whose database maps RPC interface and object information to transport-specific server endpoints. A registration can combine an interface specification, a vector of server bindings, and object UUIDs to create endpoint-map elements.

An invalid entry is therefore an endpoint-map data problem, not a generic malformed application record. The relevant fields are the interface identifier and version, object UUID, protocol sequence, endpoint, and associated tower/address representation used by DCE/RPC.

What to inspect

• Check which endpoint-management or inquiry API returned the status and capture the interface UUID/version and object UUID filter.
• For registrations, build the binding vector from RpcServerInqBindings rather than synthesizing server bindings by hand.
• Ensure registration and unregistration use matching interface, binding-vector, and object-UUID inputs.
• When interoperating with a non-Windows DCE/RPC implementation, inspect the actual endpoint-map element or protocol tower representation.

Changing the application procedure or credentials does not repair malformed endpoint-map data. Focus on registration and mapper state.

References

• Microsoft: Specifying Endpoints
• The Open Group: rpc_ep_register
• MS-RPCE endpoint mapper

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