What does Windows error code 1711 (RPC_S_ALREADY_REGISTERED) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The application tried to register an RPC object UUID that already has an object-to-type association.

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RPC_S_OBJECT_NOT_FOUND	RPC_S_TYPE_ALREADY_REGISTERED

RPC_S_ALREADY_REGISTERED

The duplicate is an object registration, not an endpoint collision

RPC_S_ALREADY_REGISTERED is returned when an object UUID is already registered in the RPC runtime's object/type mapping. In the standard object model, a non-nil object UUID can be associated with a type UUID so incoming calls are dispatched to the manager implementation registered for that type.

This is different from RPC_S_DUPLICATE_ENDPOINT. The endpoint map deals with interface and network-address reachability; object registration deals with selecting an implementation for an object UUID.

Typical causes

Initialization code runs twice and calls RpcObjectSetType again for the same object.
Two modules believe they own the same object UUID but assign different type UUIDs.
Reload or failover logic recreates object registration without first resetting the old association.

Inventory the object UUID, requested type UUID, and module that performs the registration. If the existing mapping is intentional, treat the second registration as an initialization bug. To remove an association, use the documented reset behavior rather than registering a competing type.

References

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