Hi, I am trying to develop a DCE-RPC based client which talks to a MSRPC based server running on Windows. I configured the DCE/RPC build with --enable gss-negotiate. The security nego flow on the linux rpc client is as follows unsigned32 authn_protocol = rpc_c_authn_gss_negotiate; unsigned32 authn_level = rpc_c_authn_level_pkt_privacy; rpc_binding_set_auth_info (hello_IfHandle, (unsigned_char_p_t)principal, authn_level, authn_protocol,NULL, rpc_c_authz_name, &st); if (st != rpc_s_ok) { dce_error_inq_text(st, error_text, &error_inq_st); fprintf(stderr, "Cannot set security authorization for server %s: %s\n", entry_name, error_text); } Is there anything else that need to be done.I have developed a similar windows client which works fine.But when i do the same security api flow and set the protocol and auth level it fails on linux with the following [pid: 020951] [time: 000001] [thread: 099547a8] STATE CLIENT ASSOC: 0x9954610 state->INIT_WAIT event->REJ_CONF [pid: 020951] [time: 000001] [thread: 099547a8] [file: cnrcvr.c, line: 1259] [pid: 020951] [time: 000001] [thread: 099547a8] (rpc__mem_free) type 23 @ 0xb6900468 [pid: 020951] [time: 000001] [thread: 099547a8] [file: rpcmem.c, line: 171] [pid: 020951] [time: 000001] [thread: 099547a8] STATE CLIENT ASSOC: 0x9954610 new state->CLOSED [pid: 020951] [time: 000001] [thread: 099547a8] [file: cnrcvr.c, line: 1259] [pid: 020951] [time: 000001] [thread: 09919008] CN: call_rep->0x994e400 assoc->0x9954610 desc->0x994e258 presentation negotiation failed st = 16c9a046 [pid: 020951] [time: 000001] [thread: 09919008] [file: cnassoc.c, line: 819] [pid: 020951] [time: 000001] [thread: 09919008] (rpc__cn_call_start) STATE CLIENT CALL: 0 new state->CALL_FAILED_DNE I would be grateful if anyone could guide me on this.Thanks! -- *Regards, Santosh*