Elmah not working with asp.net site

I've tried to use elmah with my asp.net site but whenever I try to go to http://localhost:port/elmah.axd I get resource not found exception. My web.config is given below.

    <?xml version="1.0"?>
    <configuration>
      <configSections>
        <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" />
          <section name="errorFilter" requirePermission="false" 
                  type="Elmah.ErrorFilterSectionHandler, Elmah"/>
        </sectionGroup>
      </configSections>
      <elmah>
        <security allowRemoteAccess="0" />
        <errorLog type="Elmah.SqlErrorLog, Elmah" 
                 connectionStringName="elmah-sql" />
        <errorMail
                from="my@account"
                to="myself"
                subject="ERROR From Elmah:"
                async="true"
                smtpPort="587"
                smtpServer="smtp.gmail.com"
                userName="my@account"
                password="mypassword" />
      </elmah>

      <connectionStrings>
        <add name="elmah-sql" connectionString="data source=(sqlserver); 
               database=elmahdb;
             integrated security=false;User ID=user;Password=password"/>
      </connectionStrings>
      <system.web>
        <compilation debug="true">
          <assemblies>
            <add assembly="Elmah, Version=1.0.10617.0, Culture=neutral, 
               PublicKeyToken=null"/>
          </assemblies>
        </compilation>
        <authentication mode="Windows"/>

        <httpHandlers>
          <remove verb="*" path="*.asmx"/>
          <add verb="*" path="*.asmx" validate="false" 
            type="System.Web.Script.Services.ScriptHandlerFactory, 
               System.Web.Extensions, Version=3.5.0.0, Culture=neutral, 
                  PublicKeyToken=31BF3856AD364E35"/>
          <add verb="*" path="*_AppService.axd" validate="false" 
               type="System.Web.Script.Services.ScriptHandlerFactory, 
               System.Web.Extensions, Version=3.5.0.0, Culture=neutral, 
                   PublicKeyToken=31BF3856AD364E35"/>
          <add verb="GET,HEAD" path="ScriptResource.axd" 
                 type="System.Web.Handlers.ScriptResourceHandler, 
               System.Web.Extensions, Version=3.5.0.0, Culture=neutral, 
                    PublicKeyToken=31BF3856AD364E35" validate="false"/>
        </httpHandlers>
        <httpModules>
          <add name="ScriptModule" type="System.Web.Handlers.ScriptModule, 
                System.Web.Extensions, Version=3.5.0.0, Culture=neutral, 
                PublicKeyToken=31BF3856AD364E35"/>
        </httpModules>
      </system.web>

      <system.webServer>
        <validation validateIntegratedModeConfiguration="false"/>
        <modules runAllManagedModulesForAllRequests="true">
          <remove name="ScriptModule"/>
          <add name="ScriptModule" preCondition="managedHandler" 
                type="System.Web.Handlers.ScriptModule, 
               System.Web.Extensions, Version=3.5.0.0, Culture=neutral, 
                 PublicKeyToken=31BF3856AD364E35"/>
          <add name="ErrorMail" type="Elmah.ErrorMailModule, Elmah"/>
          <add name="ErrorLog" type="Elmah.ErrorLogModule, Elmah"/>
          <add name="ErrorFilter" type="Elmah.ErrorFilterModule, Elmah"/>
        </modules>

        <handlers>
          <remove name="WebServiceHandlerFactory-Integrated"/>
          <remove name="ScriptHandlerFactory"/>
          <remove name="ScriptHandlerFactoryAppServices"/>
          <remove name="ScriptResource"/>
          <add name="ScriptHandlerFactory" verb="*" path="*.asmx" 
                preCondition="integratedMode" 
               type="System.Web.Script.Services.ScriptHandlerFactory, 
                    System.Web.Extensions, Version=3.5.0.0, 
               Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
          <add name="ScriptHandlerFactoryAppServices" verb="*" 
            path="*_AppService.axd" preCondition="integratedMode" 
               type="System.Web.Script.Services.ScriptHandlerFactory, 
                 System.Web.Extensions, Version=3.5.0.0, 
               Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
          <add name="ScriptResource" preCondition="integratedMode" 
            verb="GET,HEAD" path="ScriptResource.axd" 
               type="System.Web.Handlers.ScriptResourceHandler, 
            System.Web.Extensions, Version=3.5.0.0, 
               Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
          <add name="Elmah" verb="POST,GET,HEAD" path="elmah.axd" 
                       preCondition="integratedMode" 
               type="Elmah.ErrorLogPageFactory, Elmah"/>
        </handlers>
      </system.webServer>
    </configuration>

EDIT: Elmah = (Error Logging Modules and Handlers)
http://code.google.com/p/elmah/

I just had a similar problem with Elmah not working in an IIS7 deployment. I found that I needed to register the Elmah Modules and Handlers in system.web AND system.webServer:

<system.web>
...
  <httpHandlers>
    ...
    <add verb="POST,GET,HEAD" path="elmah.axd" type="Elmah.ErrorLogPageFactory, Elmah" />
    ...
  </httpHandlers>
  <httpModules>
    ...
    <add name="ErrorLog" type="Elmah.ErrorLogModule, Elmah"/>
    <add name="ErrorMail" type="Elmah.ErrorMailModule, Elmah" />
    <add name="ErrorFilter" type="Elmah.ErrorFilterModule, Elmah" />
    ...
  </httpModules>
  ...
</system.web>
<system.webServer>
  ...
  <modules runAllManagedModulesForAllRequests="true">
    ...
    <add name="ErrorLog" type="Elmah.ErrorLogModule, Elmah"/>
    <add name="ErrorMail" type="Elmah.ErrorMailModule, Elmah" />
    <add name="ErrorFilter" type="Elmah.ErrorFilterModule, Elmah" />
    ...
  </modules>
  <handlers>
    ...
    <add name="Elmah" verb="POST,GET,HEAD" path="elmah.axd" type="Elmah.ErrorLogPageFactory, Elmah" />
    ...
  </handlers>
<system.webServer>

You may be need this one also

<elmah>
    <security allowRemoteAccess="1" />
</elmah> 

when you get

> 403 - Forbidden: Access is denied. You do not have permission to view this directory or page using the credentials that you supplied.

Try registering the Modules and Handlers in the sections "httphandlers" and "httpmodules" in the <system.web> section:

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

	</httpHandlers>
	<httpModules>
        .......
		<add name="ErrorMail" type="Elmah.ErrorMailModule, Elmah"/>
		<add name="ErrorLog" type="Elmah.ErrorLogModule, Elmah"/>
		<add name="ErrorFilter" type="Elmah.ErrorFilterModule, Elmah"/>
       .......
	</httpModules>

One way to get around it today is to use nuget.

Visual studio:menu->tools->library package manager->package manager console

install-package elmah

HTH

This line was missing when I installed using NuGet (VS 2013, IIS 8.0):

<system.webServer>
  <handlers>
    <add name="Elmah" verb="POST,GET,HEAD" path="elmah.axd" type="Elmah.ErrorLogPageFactory, Elmah" />
 </handlers>
</system.webServer>

Adding it solved the 404 error problem.

The nuget package does not add the following important lines to web.config resulting in 403 error.

<configuration>
  <elmah>  
    <security allowRemoteAccess="1" />
    <errorLog type="Elmah.XmlFileErrorLog, Elmah" logPath="~/app_data/elmah" />
  </elmah>
</configuration>

Also you may want to restrict the access to error logs by

<add name="Elmah" verb="POST,GET,HEAD" path="/admin/elmah.axd" type="Elmah.ErrorLogPageFactory, Elmah" resourceType="Unspecified" requireAccess="Script" preCondition="integratedMode" />

if you are using Areas make sure that you have updated one of the appsetting key

Default

<add key="elmah.mvc.route" value="elmah" />

If you are an area as Admin

<add key="elmah.mvc.route" value="admin/elmah" />