diff --git a/source4/rpc_server/dcerpc_server.c b/source4/rpc_server/dcerpc_server.c
index 7cb8e11eeea..54ab2d0ec1d 100644
--- a/source4/rpc_server/dcerpc_server.c
+++ b/source4/rpc_server/dcerpc_server.c
@@ -666,7 +666,6 @@ static void dcesrv_call_disconnect_after(struct dcesrv_call_state *call,
 
 	call->conn->allow_bind = false;
 	call->conn->allow_alter = false;
-	call->conn->allow_auth3 = false;
 	call->conn->allow_request = false;
 
 	call->conn->default_auth_state->auth_invalid = true;
@@ -1298,7 +1297,7 @@ static NTSTATUS dcesrv_auth3(struct dcesrv_call_state *call)
 	struct tevent_req *subreq = NULL;
 	NTSTATUS status;
 
-	if (!call->conn->allow_auth3) {
+	if (!auth->auth_started) {
 		return dcesrv_fault_disconnect(call, DCERPC_NCA_S_PROTO_ERROR);
 	}
 
@@ -2476,7 +2475,6 @@ static void dcesrv_terminate_connection(struct dcesrv_connection *dce_conn, cons
 	dce_conn->wait_private = NULL;
 
 	dce_conn->allow_bind = false;
-	dce_conn->allow_auth3 = false;
 	dce_conn->allow_alter = false;
 	dce_conn->allow_request = false;
 
diff --git a/source4/rpc_server/dcerpc_server.h b/source4/rpc_server/dcerpc_server.h
index d3c0a080b27..c720816441d 100644
--- a/source4/rpc_server/dcerpc_server.h
+++ b/source4/rpc_server/dcerpc_server.h
@@ -203,6 +203,7 @@ struct dcesrv_auth {
 	NTSTATUS (*session_key_fn)(struct dcesrv_auth *, DATA_BLOB *session_key);
 	bool client_hdr_signing;
 	bool hdr_signing;
+	bool auth_started;
 	bool auth_finished;
 	bool auth_invalid;
 };
@@ -295,7 +296,6 @@ struct dcesrv_connection {
 	 * remember which pdu types are allowed
 	 */
 	bool allow_bind;
-	bool allow_auth3;
 	bool allow_alter;
 	bool allow_request;
 
diff --git a/source4/rpc_server/dcesrv_auth.c b/source4/rpc_server/dcesrv_auth.c
index c64aa20bcfc..392a25cf780 100644
--- a/source4/rpc_server/dcesrv_auth.c
+++ b/source4/rpc_server/dcesrv_auth.c
@@ -40,6 +40,12 @@ static bool dcesrv_auth_prepare_gensec(struct dcesrv_call_state *call)
 	bool want_header_signing = false;
 	NTSTATUS status;
 
+	if (auth->auth_started) {
+		return false;
+	}
+
+	auth->auth_started = true;
+
 	if (auth->auth_invalid) {
 		return false;
 	}
@@ -243,6 +249,7 @@ bool dcesrv_auth_bind(struct dcesrv_call_state *call)
 		auth->auth_type = DCERPC_AUTH_TYPE_NONE;
 		auth->auth_level = DCERPC_AUTH_LEVEL_NONE;
 		auth->auth_context_id = 0;
+		auth->auth_started = true;
 
 		log_successful_dcesrv_authz_event(call);
 
@@ -338,7 +345,6 @@ NTSTATUS dcesrv_auth_prepare_bind_ack(struct dcesrv_call_state *call, struct nca
 	struct dcesrv_auth *auth = call->auth_state;
 
 	dce_conn->allow_alter = true;
-	dce_conn->allow_auth3 = true;
 
 	if (call->pkt.auth_length == 0) {
 		auth->auth_finished = true;