Why I am getting this message (Sys.WebForms.PageRequestManagerServerErrorException: 405) in the root domain?

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C#

Telerik

ASP.NET4

I have written a web-based application using the ASP.NET 4.0 with Telerik Tool. Locally the application works great; everything works as expected as well as on the server running Windows Server 2008 R2 32-bit. When I move the app to IIS 7.5 running on Windows Server 2008 R2 64-bit, I faced the following error when I tried to browse the website using the following link:
http://ServerName.AppName

ERROR:

Sys.WebForms.PageRequestManagerServerErrorException: 405

However, this issue was solved by pointing the address bar to the full URL (i.e.: "http://ServerName.AppName/Default.aspx"). But this is not a solution, because the application should be browsed without writing this part (default.aspx), So how to fix this problem?

My web.config file:

<?xml version="1.0" encoding="UTF-8"?>
    <!--
      For more information on how to configure your ASP.NET application, please visit
      http://go.microsoft.com/fwlink/?LinkId=169433
      -->
    <configuration>
      <connectionStrings>
        <add connectionString="Data Source=localhost\sqlexpress;Initial Catalog=PMODServices;Integrated Security=True" name="PMODServicesConnectionString" providerName="System.Data.SqlClient" />
      </connectionStrings>
      <system.web>
        <customErrors mode="Off" />
        <compilation debug="true" targetFramework="4.0">
          <assemblies>
            <add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
            <add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
            <add assembly="System.Speech, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
            <add assembly="System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
            <add assembly="System.Runtime.Serialization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
            <add assembly="System.ServiceModel, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
            <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
            <add assembly="System.Xml.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
            <add assembly="System.Data.DataSetExtensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
            <add assembly="Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
            <add assembly="Microsoft.ReportViewer.Common, Version=10.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
            <add assembly="Microsoft.Build.Framework, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
            <add assembly="System.Management, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
            <!--  <add assembly="office, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71E9BCE111E9429C"/>  -->
            <add assembly="stdole, Version=7.0.3300.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
          </assemblies>
          <buildProviders>
            <add extension=".rdlc" type="Microsoft.Reporting.RdlBuildProvider, Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
          </buildProviders>
        </compilation>
        <!--
                The <authentication> section enables configuration
                of the security authentication mode used by
                ASP.NET to identify an incoming user.
            -->
        <authentication mode="Windows" />
        <httpHandlers>
          <add path="Telerik.Web.UI.WebResource.axd" verb="*" type="Telerik.Web.UI.WebResource" validate="false" />
          <add path="ChartImage.axd" verb="*" type="Telerik.Web.UI.ChartHttpHandler" validate="false" />
          <add path="Telerik.Web.UI.SpellCheckHandler.axd" verb="*" type="Telerik.Web.UI.SpellCheckHandler" validate="false" />
          <add path="Telerik.Web.UI.DialogHandler.aspx" verb="*" type="Telerik.Web.UI.DialogHandler" validate="false" />
          <add path="Telerik.RadUploadProgressHandler.ashx" verb="*" type="Telerik.Web.UI.RadUploadProgressHandler" validate="false" />
          <add path="Reserved.ReportViewerWebControl.axd" verb="*" type="Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" validate="false" />
        </httpHandlers>
        <pages controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID">
          <controls>
            <add tagPrefix="telerik" namespace="Telerik.Web.UI" assembly="Telerik.Web.UI" />
          </controls>
        </pages>
        <httpModules>
          <add name="RadUploadModule" type="Telerik.Web.UI.RadUploadHttpModule" />
          <add name="RadCompression" type="Telerik.Web.UI.RadCompression" />
        </httpModules>
      </system.web>
      <system.webServer>
        <validation validateIntegratedModeConfiguration="false" />
        <handlers>
          <remove name="ChartImage_axd" />
          <remove name="Telerik_Web_UI_SpellCheckHandler_axd" />
          <remove name="Telerik_Web_UI_DialogHandler_aspx" />
          <remove name="Telerik_RadUploadProgressHandler_ashx" />
          <remove name="Telerik_Web_UI_WebResource_axd" />
          <add name="Telerik_Web_UI_WebResource_axd" path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" verb="*" preCondition="integratedMode" />
          <add name="ChartImage_axd" path="ChartImage.axd" type="Telerik.Web.UI.ChartHttpHandler" verb="*" preCondition="integratedMode" />
          <add name="Telerik_Web_UI_SpellCheckHandler_axd" path="Telerik.Web.UI.SpellCheckHandler.axd" type="Telerik.Web.UI.SpellCheckHandler" verb="*" preCondition="integratedMode" />
          <add name="Telerik_Web_UI_DialogHandler_aspx" path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler" verb="*" preCondition="integratedMode" />
          <add name="Telerik_RadUploadProgressHandler_ashx" path="Telerik.RadUploadProgressHandler.ashx" type="Telerik.Web.UI.RadUploadProgressHandler" verb="*" preCondition="integratedMode" />
          <add name="ReportViewerWebControlHandler" preCondition="integratedMode" verb="*" path="Reserved.ReportViewerWebControl.axd" type="Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
        </handlers>
        <modules runAllManagedModulesForAllRequests="true">
          <remove name="RadUploadModule" />
          <remove name="RadCompression" />
          <add name="RadUploadModule" type="Telerik.Web.UI.RadUploadHttpModule" preCondition="integratedMode" />
          <add name="RadCompression" type="Telerik.Web.UI.RadCompression" preCondition="integratedMode" />
        </modules>
            <defaultDocument>
                <files>
                    <clear />
                    <add value="default.aspx" />
                    <add value="Default.htm" />
                    <add value="Default.asp" />
                    <add value="index.htm" />
                    <add value="index.html" />
                    <add value="iisstart.htm" />
                </files>
            </defaultDocument>
      </system.webServer>
      <appSettings>
        <add key="Telerik.ScriptManager.TelerikCdn" value="Enabled" />
        <add key="Telerik.StyleSheetManager.TelerikCdn" value="Enabled" />
      </appSettings>
      <!-- I added the following to solve (asp.net ajax client-side framework failed to load) error that I especially faced on the Test Server only -->
      <location path="WebResource.axd">
        <system.web>
          <authorization>
            <allow users="*" />
          </authorization>
        </system.web>
      </location>
      <location path="ScriptResource.axd">
        <system.web>
          <authorization>
            <allow users="*" />
          </authorization>
        </system.web>
      </location>
      <location path="Telerik.Web.UI.WebResource.axd">
        <system.web>
          <authorization>
            <allow users="*" />
          </authorization>
        </system.web>
      </location>
    </configuration>