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<p>Some of our portable users experienced IP Address conflict when resuming their machines from sleep mode.</p>
<p>An IP address conflict occurs when two computers on a LAN (local area network) or the Internet have been assigned the same IP address. IP conflicts usually render either one or both of computers unusable for network operations.</p>
<p>To avoid this situation you can extend the lease for the Scope or use a DHCP reservations.</p>
<p>If above suggested is not acceptible for you, there is also another way to fix DHCP address conflicts by creating a simple batch file that will renew IP address automatically in the case of IP conflict.</p>
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<p>Open Event Viewer and check the System Event Log. Find the event 4199 and choose to <em>Attach Task to This Event</em> option.</p>
<p><img class=" size-full wp-image-424" src="http://wincert.net/wp-content/uploads/2013/01/dhcp_conflict_1.png" alt="" width="341" height="92" border="0" /></p>
<p>Create a new task and configure it to run a batch file/program. Create a new .bat file with following lines:</p>
<p><strong>IPCONFIG /RELEASE</strong><br />
<strong>IPCONFIG /RENEW</strong></p>
<p>Now select this .bat file in the Program/script prompt.</p>
<p><img class=" size-full wp-image-425" src="http://wincert.net/wp-content/uploads/2013/01/dhcp_conflict_2.png" alt="" width="377" height="155" border="0" /></p>
<p>After creating task open Properties of it and choose the option to run the task with highest privileges or the task won&#8217;t work, because users do not have the neccesarry rights to release or renew IP address from the DHCP server.</p>
<p><img class=" size-full wp-image-426" src="http://wincert.net/wp-content/uploads/2013/01/dhcp_conflict_3.png" alt="" width="417" height="139" border="0" /></p>