DCOM In WORKGROUP Environment Access Denied - Setting authninfo Does not Help

Question

I am stetting up DCOM NT Service in a Workgroup environment on Windows7 machines.  The client machine is Windows7 and so is the server.  There is no domain involved.  I am calling CoInitializeSecurity on both client and server.  The client applicaiton works only locally.  When it is setup to run remotly, I get access denied.  I have noticed a few others are having a simular issue when the client is not XP.  I have tried to set authentication info on the client.  But it didn't work. 

Odly enough the network traces mention the user who is logged in to the server.  I have tried creating an account with the same name as the one mentioned in the trace on the client and was still denied access when running the clieint app as that user.

5	0.001592	192.168.1.61	192.168.1.60	TCP	excw > epmap [SYN] Seq=0 Win=8192 Len=0 MSS=1460 SACK_PERM=1
6	0.002039	192.168.1.60	192.168.1.61	TCP	epmap > excw [SYN, ACK] Seq=0 Ack=1 Win=8192 Len=0 MSS=1460 SACK_PERM=1
7	0.002137	192.168.1.61	192.168.1.60	TCP	excw > epmap [ACK] Seq=1 Ack=1 Win=64240 Len=0
8	0.002452	192.168.1.61	192.168.1.60	DCERPC	Bind: call_id: 2, 2 context items, 1st IOXIDResolver V0.0
9	0.004181	192.168.1.60	192.168.1.61	DCERPC	Bind_ack: call_id: 2 Unknown result (3), reason: Local limit exceeded
10	0.004407	192.168.1.61	192.168.1.60	IOXIDResolver	ServerAlive2 request
11	0.005822	192.168.1.60	192.168.1.61	IOXIDResolver	ServerAlive2 response[Long frame (2 bytes)]
12	0.006504	192.168.1.61	192.168.1.60	TCP	cspmlockmgr > epmap [SYN] Seq=0 Win=8192 Len=0 MSS=1460 SACK_PERM=1
13	0.007272	192.168.1.60	192.168.1.61	TCP	epmap > cspmlockmgr [SYN, ACK] Seq=0 Ack=1 Win=8192 Len=0 MSS=1460 SACK_PERM=1
14	0.007359	192.168.1.61	192.168.1.60	TCP	cspmlockmgr > epmap [ACK] Seq=1 Ack=1 Win=64240 Len=0
15	0.012878	192.168.1.61	192.168.1.60	DCERPC	Bind: call_id: 3 ISystemActivator V0.0, NTLMSSP_NEGOTIATE
16	0.014403	192.168.1.60	192.168.1.61	DCERPC	Bind_ack: call_id: 3, NTLMSSP_CHALLENGE accept max_xmit: 5840 max_recv: 5840
17	0.014978	192.168.1.61	192.168.1.60	DCERPC	AUTH3: call_id: 3, NTLMSSP_AUTH, User: TS-07-PC\TS-08
18	0.015318	192.168.1.61	192.168.1.60	ISystemActivator	RemoteGetClassObject request
19	0.017808	192.168.1.60	192.168.1.61	TCP	epmap > cspmlockmgr [ACK] Seq=307 Ack=1469 Win=62892 Len=0
20	0.019517	192.168.1.60	192.168.1.61	DCERPC	Fault: call_id: 3 ctx_id: 1 status: nca_s_fault_access_denied

	HRESULT hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);
	ATLASSERT(S_OK == hr);


	SEC_WINNT_AUTH_IDENTITY_W authidentity;
	SecureZeroMemory( &authidentity, sizeof(authidentity) );

	authidentity.User = (unsigned short *)"dcomu";
	authidentity.UserLength = static_cast<unsigned long>(wcslen((LPWSTR) authidentity.User ));
	authidentity.Domain = (unsigned short *) "Station-08";
	authidentity.DomainLength = static_cast<unsigned long>(wcslen((LPWSTR) authidentity.Domain));
	authidentity.Password = (unsigned short *) "testing";
	authidentity.PasswordLength = static_cast<unsigned long>(wcslen((LPWSTR) authidentity.Password ));
	authidentity.Flags = SEC_WINNT_AUTH_IDENTITY_UNICODE;

	SOLE_AUTHENTICATION_INFO authninfo;
	SecureZeroMemory(&authninfo, sizeof(SOLE_AUTHENTICATION_INFO) );

	// NTLM Settings
	authninfo.dwAuthnSvc = RPC_C_AUTHN_WINNT;
	authninfo.dwAuthzSvc = RPC_C_AUTHZ_NONE;
	authninfo.pAuthInfo = &authidentity;

	SOLE_AUTHENTICATION_LIST  authentlist;

	authentlist.cAuthInfo = 1;
	authentlist.aAuthInfo = &authninfo;

	hr = CoInitializeSecurity(NULL, -1, NULL, NULL,
			RPC_C_AUTHN_LEVEL_CONNECT,
			RPC_C_IMP_LEVEL_ANONYMOUS,
			&authentlist, 
			EOAC_NONE, 
			NULL);
	ATLASSERT(SUCCEEDED(hr));

Answer 1

Did you ever find a solution for this?  I have a very similar issue and would LOVE to find out how to fix it!

Answer 2

I'm having the same issue as well.  Would like to know if there's a solution...