--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/SDK/Source/GUID-21F92FAD-1EF1-4E36-9157-9214E7C6BB01.dita	Thu Jan 21 18:18:20 2010 +0000
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
+<!-- This component and the accompanying materials are made available under the terms of the License 
+"Eclipse Public License v1.0" which accompanies this distribution, 
+and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
+<!-- Initial Contributors:
+    Nokia Corporation - initial contribution.
+Contributors: 
+-->
+<!DOCTYPE concept
+  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
+<concept id="GUID-21F92FAD-1EF1-4E36-9157-9214E7C6BB01" xml:lang="en"><title>Host
+name resolution</title><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>Sometimes it is necessary to authenticate the remote device that is
+connected through a public IP network. You can do this by querying and comparing
+the <i>domain name system</i> (DNS) name of the device to its IP address.
+To perform host resolve queries to both directions, use the <codeph><xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/ESock_Server/RHostResolverClass.html" format="application/java-archive">RHostResolver</xref></codeph> class. </p>
+<p>Note that this is not a secure way to authenticate remote devices, because
+some clients (for example, in a local network) may not have DNS names at all
+. For reliable authentication and secure communication, use stronger methods
+like key exchange or secure protocol solutions.</p>
+</conbody></concept>
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