While using native API SID history sync you can encounter following werror in DSA.log
01/24/18 11:29:52 (GMT+01:00) Activation AcAdSwitches SIDHistory Switch (native API), adding SIDHistory failed: 0x6ba.
01/24/18 11:29:52 (GMT+01:00) Common AcAdSwitches Error 0x800706ba. The RPC server is unavailable.