Help with Elmah Configuration in ASP.NET

Question

I'm trying to setup ELMAH to log errors for our application. I have successfully added the modules and am having no problems loading the ErrorLog page (elmah.axd). However, Elmah isn't logging any test exceptions that I'm generating.

My web.config looks like this:

<configSections>
    <!-- Other stuff -->
    <sectionGroup name="elmah">
        <section name="security" requirePermission="false" type="Elmah.SecuritySectionHandler, Elmah"/>
        <section name="errorLog" requirePermission="false" type="Elmah.ErrorLogSectionHandler, Elmah"/>
        <section name="errorMail" requirePermission="false" type="Elmah.ErrorMailSectionHandler, Elmah"/>
    </sectionGroup>
</configSections>

<elmah>
    <errorLog type="Elmah.XmlFileErrorLog, Elmah" logPath="~/App_Data" /> 
</elmah> 

<httpHandlers> 
    <!-- Other stuff -->
    <add verb="POST,GET,HEAD" path="elmah.axd" type="Elmah.ErrorLogPageFactory, Elmah"/>
</httpHandlers>

<httpModules>
    <!-- Other stuff -->
    <add name="ErrorMail" type="Elmah.ErrorMailModule, Elmah"/>
    <add name="ErrorLog" type="Elmah.ErrorLogModule, Elmah"/>
    <add name="ErrorFilter" type="Elmah.ErrorFilterModule, Elmah"/>
</httpModules>

Hitting the test exception page http://localhost/elmah.axd/test generates a yellow screen, but no log entry.

Between the sample provided and the tutorial on DotNetSlackers I can't see anything wrong. Is there something I'm missing? I've also attempted to generate errors via Signaling, but that's not working either.

I am running this against DotNetNuke, and so that's where I'm currently thinking the problem lies.

Answer 1

I think what you need is to do is disable custom error messages in DotNetNuke.
1. Log on dnn Portal as host
2. Navigate to Host > Host Settings.
2. Go to the Basic Settings - Appearance section.
3. At Use Custom Error Messages, uncheck the check box.
4. Click Update.
This will disable DotNetNuke's error handler.

Answer 2

Could be that DNN is swallowing the exceptions - does it have its own Exception handling mechanism?

I was using ELMAH with Monorail and ran into a similar issue - Castle MonoRail & ELMAH

FYI Someone else with the same problem.

Answer 3

DNN does process all exceptions, so that's probably the issue you're seeing. I believe it handles the Error event at the application level, logging everything to the database. I don't know of any way to turn this off, but I've never really tried that hard, either.