<p><a href="http://wincert.net/wp-content/uploads/2015/01/networking.jpg"><img class="alignnone size-full wp-image-562" src="http://wincert.net/wp-content/uploads/2015/01/networking.jpg" alt="networking box" width="720" height="340" /></a></p>
<p>When a client computer connects to a Microsoft Windows 2000-based computer or a Microsoft Windows Server 2003-based computer by using an alias name, the client may receive the following error message:</p>
<p><strong>A duplicate name exists on the network.</strong></p>
<p>Although, you&#8217;re able to access the computer by FQDN or IP address, you&#8217;re unable to access it by using DNS alias.</p>
<p>This problem can occur when you try to connect to the server by using a CNAME alias that is created in the DNS zone. For example, this problem may occur with a command similar to the following sample command</p>
<p><strong>net view \\alias.domain name.com</strong></p>
<p>where alias is a CNAME record that is created for the server in the domain name.com zone. The server is not &#8220;listening&#8221; on the alias, and therefore is not accepting connections to that name.<!--more--></p>
<p><strong>Here&#8217;s how to fix this on Windows Server 2003</strong></p>
<p>To resolve this problem in Windows Server 2003, follow these steps:</p>
<ol style="-webkit-box-sizing: border-box; position: relative;">
<li style="-webkit-box-sizing: border-box; position: relative;">Create the CNAME record for the file server on the appropriate DNS server, if the CNAME record is not already present.</li>
<li style="-webkit-box-sizing: border-box; position: relative;">Apply the following registry change to the file server. To do so, follow these steps:
<ol style="-webkit-box-sizing: border-box; position: relative;">
<li style="-webkit-box-sizing: border-box; position: relative;">Start Registry Editor (Regedt32.exe).</li>
<li style="-webkit-box-sizing: border-box; position: relative;">Locate and click the following key in the registry:<br />
<span style="color: #003366;">HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanmanServer\Parameters</span></li>
<li style="-webkit-box-sizing: border-box; position: relative;">On the <strong>Edit</strong> menu, click <strong>Add Value</strong>, and then add the following registry value:
<div class="indent" style="-webkit-box-sizing: border-box; padding: 0px 20px 10px 20px;"><span style="color: #003366;">Value name: DisableStrictNameChecking<br style="-webkit-box-sizing: border-box;" />Data type: REG_DWORD<br style="-webkit-box-sizing: border-box;" />Radix: Decimal<br style="-webkit-box-sizing: border-box;" />Value: 1</span></div>
</li>
<li style="-webkit-box-sizing: border-box; position: relative;">Quit Registry Editor.</li>
</ol>
</li>
<li style="-webkit-box-sizing: border-box; position: relative;">Restart your computer.</li>
</ol>
<p>You may also have to set the SPN (Service Principal Name) for the Alias Name.<br style="-webkit-box-sizing: border-box;" />For example, you may have to enter a command that resembles the following commands:</p>
<p><strong>setspn -a host/aliasname targetserver</strong><br />
<strong> setspn -a host/aliasname.contoso.com targetserver</strong></p>