RPC_S_UNSUPPORTED_TRANS_SYN 0x800706C2

Error code 1730 · HRESULT 0x800706C2

WINDOWS

The transfer syntax is not supported by the RPC server.

Windows troubleshooting diagram: Device Manager warning and a system file scan
Windows errors: check drivers, system files and Event Viewer, in that order.

What it means

RPC_S_UNSUPPORTED_TRANS_SYN is a Windows error code (system error 1730, returned as HRESULT 0x800706C2) reported by Windows. Its official message is: “The transfer syntax is not supported by the RPC server.”

How to fix RPC_S_UNSUPPORTED_TRANS_SYN

  1. Reboot once — many one-off system codes disappear with a clean restart
  2. Repair system files: 'sfc /scannow' then 'DISM /Online /Cleanup-Image /RestoreHealth'
  3. Find the source in Event Viewer → System: filter for this exact code and open its provider link

Related errors

RPC_S_UNSUPPORTED_TYPERPC_S_UNSUPPORTED_NAME_SYNTAXRPC_S_UNSUPPORTED_AUTHN_LEVELRPC_S_PROXY_ACCESS_DENIEDRPC_S_PROTOCOL_ERRORRPC_S_CALL_FAILED_DNE

Source: Microsoft WinError.h

Last updated: