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RPC_NT_ALREADY_REGISTERED
RPC_NT_ALREADY_REGISTERED is an NTSTATUS value used by the Windows RPC runtime. This status reports a duplicate object UUID registration in the RPC runtime. It normally points to lifecycle ordering: an initialization path has registered an object that another path registers again, or a cleanup path did not remove a previous registration as expected.
It differs from RPC_NT_TYPE_ALREADY_REGISTERED, which concerns a manager type UUID rather than an object UUID. It is also different from RPC_NT_ENTRY_ALREADY_EXISTS, which refers to a name-service entry.
The server attempted to register an object UUID that is already present
- Log each object UUID registration with process lifetime, service restart and teardown events.
- Check idempotence of initialization code rather than masking the duplicate by ignoring the return value.
- Confirm that an object is not being registered concurrently by two service components using the same UUID.
References
- Microsoft: RPC return values
- Microsoft: Server-side binding
- The Open Group: DCE 1.1 RPC specification
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