From e02682327dab607ef52c4a925081b31b1c574a2b Mon Sep 17 00:00:00 2001
From: Sheng Yang <sheng.yang@citrix.com>
Date: Tue, 10 Dec 2013 17:32:00 -0800
Subject: [PATCH] CLOUDSTACK-5453: Fix VPN connection monitoring in KVM

It's broken by:

commit 7f104b1feb489ae09b1a2060262a122deda44a8e
Author: Edison Su <sudison@gmail.com>
Date: Fri Oct 12 18:24:50 2012 -0700

    [PATCH] CLOUDSTACK-335: fix lb for vpc on kvm
---
 .../agent/resource/virtualnetwork/VirtualRoutingResource.java   | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/src/com/cloud/agent/resource/virtualnetwork/VirtualRoutingResource.java b/core/src/com/cloud/agent/resource/virtualnetwork/VirtualRoutingResource.java
index 34450fe1601..15f1c40e3ce 100755
--- a/core/src/com/cloud/agent/resource/virtualnetwork/VirtualRoutingResource.java
+++ b/core/src/com/cloud/agent/resource/virtualnetwork/VirtualRoutingResource.java
@@ -663,7 +663,7 @@ public class VirtualRoutingResource implements Manager {
         }
 
         final String result = routerProxy("checkbatchs2svpn.sh", routerIP, args);
-        if (result != null) {
+        if (result == null || result.isEmpty()) {
             return new CheckS2SVpnConnectionsAnswer(cmd, false, "CheckS2SVpnConneciontsCommand failed");
         }
         return new CheckS2SVpnConnectionsAnswer(cmd, true, result);