<customErrors mode="Off"/> not working

I have an application that for some reason after session timeout is giving me a runtime erro. I am trying to detemrine specifically where the error is and so I set the web.config to <customErrors mode="Off"/>

however for some reason I am still not able to get the error to display remotely.

I dont get the error in my dev environement only when I push it to the server. Trying to duplicate the error on the server does not result in an error...instead the web browser locks up.

Looking for some help getting the <customErrors mode="Off"/> to work so I can fiund out what the dang error is.


<?xml version="1.0"?><configuration>
  <configProtectedData>
    <providers>
      <add name="myProtectedConfigProvider" type="System.Configuration.RsaProtectedConfigurationProvider, System.Configuration, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" useMachineContainer="true" keyContainerName="myEncryptionKeys"/>
    </providers>
  </configProtectedData>


  <appSettings/>

  <connectionStrings configSource="connection.config"/>

  <system.web>
    <!--
            Set compilation debug="true" to insert debugging
            symbols into the compiled page. Because this
            affects performance, set this value to true only
            during development.
        -->
    <compilation debug="true">
                  <assemblies>
                        <add assembly="System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
                        <add assembly="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/></assemblies></compilation>
    <!--
            The <authentication> section enables configuration
            of the security authentication mode used by
            ASP.NET to identify an incoming user.
        -->
    <authentication mode="Windows"/>
    <!--
            The <customErrors> section enables configuration
            of what to do if/when an unhandled error occurs
            during the execution of a request. Specifically,
            it enables developers to configure html error pages
            to be displayed in place of a error stack trace.

    <customErrors mode="Off"/>

        -->
  </system.web>
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