From e2669cb5d3423979dc66704b3bb27b3f482a1dee Mon Sep 17 00:00:00 2001
From: Olivier Lambert <olivier.lambert@vates.fr>
Date: Wed, 30 Dec 2015 11:19:44 +0100
Subject: [PATCH] Update troubleshooting.md

---
 troubleshooting.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/troubleshooting.md b/troubleshooting.md
index aae26801c..2cb97e67d 100644
--- a/troubleshooting.md
+++ b/troubleshooting.md
@@ -2,6 +2,12 @@
 
 This page recap the possible actions to realize if you have any problems with your XOA.
 
+## Empty page after login
+
+This is happening when your anti-virus or firewall is blocking websocket protocol. This is what we use to communicate between `xo-server` and `xo-web` (see the [architecture page](architecture.md)).
+
+The solution is to use **HTTPS**. In this way, websockets will be encapsulated in the secured protocol, avoiding interception from your firewalls or anti-virus system.
+
 ## XOA configuration
 
 XOA is a virtual appliance running Debian and Xen Orchestra. If you have any problem, the first thing to do is to check the network configuration.