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Before merging the s4 and s3 RPC servers the make_internal_rpc_pipe_p() function did not fail when the requested interface was not registered in the calling process because it did not check the return value of rpc_srv_get_pipe_cmds(). If the interface was not registed, the pointer to the interface functions was NULL and later, when dispatching a call, rpcint_dispatch() returned NT_STATUS_RPC_PROCNUM_OUT_OF_RANGE in this case. After merging the RPC servers, the rpc_pipe_open_internal() function will return NT_STATUS_RPC_INTERFACE_NOT_FOUND if the interface is not registered in the calling process. This causes a noisy error message in winbind when it tries to open the dssetup pipe to the primary domain and it is not an AD domain. The callers of wb_open_internal_pipe() when connecting to the domain already logs the error at level greather or equal to five. This commit moves the dupplicated and noisy error message at level zero from wb_open_internal_pipe() to its callers outside winbindd_cm.c. This error can be seen in winbindd logs of ad_member and nt4_member test environments. [2021/03/01 16:49:38.486004, 0, pid=12456] ../../source3/winbindd/winbindd_cm.c:1893(wb_open_internal_pipe) open_internal_pipe: Could not connect to dssetup pipe: NT_STATUS_RPC_INTERFACE_NOT_FOUND Signed-off-by: Samuel Cabrero <scabrero@samba.org> Reviewed-by: Jeremy Allison <jra@samba.org>