<p><a href="http://wincert.net/wp-content/uploads/2015/01/networking2.jpg"><img class="alignnone size-full wp-image-563" src="http://wincert.net/wp-content/uploads/2015/01/networking2.jpg" alt="networking box" width="720" height="340" /></a></p>
<p>To enable an Active Directory domain member to use DNS to locate domain controllers in domains that have single-label DNS names that are in other forests, follow these steps:</p>
<ol style="-webkit-box-sizing: border-box; position: relative;">
<li style="-webkit-box-sizing: border-box; position: relative;">Click <span class="uiterm" style="-webkit-box-sizing: border-box;">Start</span>, click <span class="uiterm" style="-webkit-box-sizing: border-box;">Run</span>, type <span class="userInput" style="-webkit-box-sizing: border-box; margin: 10px 0px 10px 0px;">regedit</span>, and then click <span class="uiterm" style="-webkit-box-sizing: border-box;">OK</span>.</li>
<li style="-webkit-box-sizing: border-box; position: relative;">Locate and then click the following subkey: <strong>HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Netlogon\Parameters<br />
</strong></li>
<li style="-webkit-box-sizing: border-box; position: relative;">In the right pane, locate the <span class="uiterm" style="-webkit-box-sizing: border-box;">AllowSingleLabelDnsDomain</span> entry. If the<span class="uiterm" style="-webkit-box-sizing: border-box;">AllowSingleLabelDnsDomain</span> entry does not exist, follow these steps:
<ol style="-webkit-box-sizing: border-box; position: relative;">
<li style="-webkit-box-sizing: border-box; position: relative;">On the <span class="uiterm" style="-webkit-box-sizing: border-box;">Edit</span> menu, point to <strong>New</strong>, and then click <strong>DWORD</strong> <span class="uiterm" style="-webkit-box-sizing: border-box;">Value</span>.</li>
<li style="-webkit-box-sizing: border-box; position: relative;">Type <strong>AllowSingleLabelDnsDomain </strong>as the entry name, and then press ENTER.</li>
</ol>
</li>
<li style="-webkit-box-sizing: border-box; position: relative;">Double-click the <span class="uiterm" style="-webkit-box-sizing: border-box;">AllowSingleLabelDnsDomain</span> entry.</li>
<li style="-webkit-box-sizing: border-box; position: relative;">In the <span class="uiterm" style="-webkit-box-sizing: border-box;">Value data</span> box, type <span class="userInput" style="-webkit-box-sizing: border-box; margin: 10px 0px 10px 0px;">1</span>, and then click <span class="uiterm" style="-webkit-box-sizing: border-box;">OK</span></li>
<li style="-webkit-box-sizing: border-box; position: relative;">Quit Registry Editor.You should be able to join the machine to the domain.</li>
</ol>