diff --git a/source4/rpc_server/common/reply.c b/source4/rpc_server/common/reply.c
index 007b68083bf..8e56e1eacab 100644
--- a/source4/rpc_server/common/reply.c
+++ b/source4/rpc_server/common/reply.c
@@ -259,5 +259,12 @@ _PUBLIC_ NTSTATUS dcesrv_reply(struct dcesrv_call_state *call)
 NTSTATUS dcesrv_generic_session_key(struct dcesrv_connection *c,
 				    DATA_BLOB *session_key)
 {
+	enum dcerpc_transport_t transport =
+		dcerpc_binding_get_transport(c->endpoint->ep_description);
+
+	if (transport != NCALRPC && transport != NCACN_UNIX_STREAM) {
+		return NT_STATUS_NO_USER_SESSION_KEY;
+	}
+
 	return dcerpc_generic_session_key(NULL, session_key);
 }