<p>Hi, I have just finshed a site and uploaded it to host WebHost4Life, unfortunately I got an error while trying to setup my site "500 - Internal Server Error". I researched and saw an article where you can add the following tags in your web.config right after "&lt;system.webServer&gt;" to get a more detail error message:<br /> &#160; &#160;&#160; &#160; &#160;&#160; &#160;&#160; &lt;httpErrors errorMode="Detailed"/&gt;<br /> &#160; &#160; &#160;&#160; &#160;&#160; &#160;&#160; &lt;asp scriptErrorSentToBrowser="true"/&gt;</p> <p>&#160;</p> <p>I got the error message as follows :</p> <div id="content"> <div class="content-container"><fieldset><legend>Error Summary</legend> <h2>HTTP Error 500.19 - Internal Server Error</h2> <h3>The requested page cannot be accessed because the related configuration data for the page is invalid.</h3> </fieldset></div> <div class="content-container"><fieldset><legend>Detailed Error Information</legend> <div id="details-left"> <table cellspacing="0" cellpadding="0" border="0"> <tbody> <tr class="alt"> <th>Module</th> <td>IIS Web Core</td> </tr> <tr> <th>Notification</th> <td>BeginRequest</td> </tr> <tr class="alt"> <th>Handler</th> <td>Not yet determined</td> </tr> <tr> <th>Error Code</th> <td>0x800700b7</td> </tr> <tr class="alt"> <th>Config Error</th> <td>Cannot add duplicate collection entry of type 'add' with unique key attribute 'name' set to 'LogoffHandler*'</td> </tr> <tr> <th>Config File</th> <td>\\xxxxxxxx\xxxx\xxxxxxx\source\web.config</td> </tr> </tbody> </table> </div> <div id="details-right"> <table cellspacing="0" cellpadding="0" border="0"> <tbody> <tr class="alt"> <th>Requested URL</th> <td>http://www.xxxxxxxxxxxxxxxxxxxxxxxx.net:80/source/</td> </tr> <tr> <th>Physical Path</th> <td>\\xxxxxxxxxx\xxxxxxxxxxx\whl.tailormade2\source\</td> </tr> <tr class="alt"> <th>Logon Method</th> <td>Not yet determined</td> </tr> <tr> <th>Logon User</th> <td>Not yet determined</td> </tr> </tbody> </table> </div> </fieldset></div> <div class="config_source content-container"><fieldset> <legend>Config Source</legend> <pre><code> 95: &lt;remove name="WebServiceHandlerFactory-Integrated" /&gt;<br /><span class="highlight-code"> 96: &lt;add name="LogoffHandler*" path="Logoff.aspx" verb="*" type="DotNetNuke.Services.Authentication.LogOffHandler, DotNetNuke" preCondition="integratedMode,runtimeVersionv2.0" /&gt;</span><br /> 97: &lt;add name="RSSHandler" path="RSS.aspx" verb="*" type="DotNetNuke.Services.Syndication.RssHandler, DotNetNuke" preCondition="integratedMode,runtimeVersionv2.0" /&gt;<br /></code></pre> </fieldset></div> <div class="content-container"><fieldset><legend>Links and More Information</legend> This error occurs when there is a problem reading the configuration file for the Web server or Web application. In some cases, the event logs may contain more information about what caused this error. <p><a href="http://go.microsoft.com/fwlink/?LinkID=62293&amp;IIS70Error=500,19,0x800700b7,6002">View more information »</a></p> </fieldset></div> </div> <p>I am not sure what to do or what the cause is of this issue is, hoping someone can assist me as this seems to work on my local machine just fine. Please Help...???</p>