bjoerns Hey all, i try to connect old Outlook 2007 Clients to Grommunio but that does not work. I see in the nginx-rpc-access.log they try connect to the RPC Service in the right way, but it seems that there is no port 6004 (tcp/ncacn) open on grommunio. "RPC_OUT_DATA /rpc/rpcproxy.dll?grommunio.test.int:6004 HTTP/1.1" 401 0 "-" "MSRPC" Is there an additional configuration required for port 6004?