--- a/source3/utils/net_util.c.orig	2016-11-30 00:09:59.368494419 +0000
+++ a/source3/utils/net_util.c	2016-11-30 00:10:09.914099362 +0000
@@ -106,6 +106,12 @@
 {
 	NTSTATUS nt_status;
 	int flags = 0;
+	int signing_state = SMB_SIGNING_IPC_DEFAULT;
+
+	if(((struct functable*)c->private_data)->valid_transports == NET_TRANSPORT_RAP)
+	{
+                signing_state = SMB_SIGNING_DEFAULT;
+	}
 
 	c->opt_password = net_prompt_pass(c, c->opt_user_name);
 
@@ -127,7 +133,7 @@
 					service_name, service_type,
 					c->opt_user_name, c->opt_workgroup,
 					c->opt_password, flags,
-					SMB_SIGNING_IPC_DEFAULT);
+					signing_state);
 	if (!NT_STATUS_IS_OK(nt_status)) {
 		d_fprintf(stderr, _("Could not connect to server %s\n"),
 			  server_name);