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copied!<p>Two common reasons for breakpoints not being hit in an HttpModule are:</p> <h3>The breakpoint is in code that is called during the module's construction.</h3> <p>This one always get's me. If you want to debug the module's construction <strong><em>you should manually attach the debugger</em></strong>. To do this on Windows 7 (it'll be similar on Vista):</p> <ol> <li><em>Debug | Attach to Process...</em></li> <li>Check <em>Show processes in all sessions</em>.</li> <li>Select the your worker process instance (<em>w3wp.exe</em>)</li> <li>Click <em>Attach</em>.</li> </ol> <p>Refresh your browser and you should now hit your breakpoint.</p> <h3>The module is not actually being loaded because of a configuration issue.</h3> <p>If you can tell that the module code is <em>definitely</em> being executed then this is not the problem. But sometimes, while a module is loading fine on other machines it might not be loading on your dev box because you have a different version of IIS and you don't have the necessary config.</p> <p>If this is the the case then make sure the module is wired up correctly for all required versions of IIS.</p> <p>For IIS 5.1 and IIS 6...</p> <pre><code><system.web> <httpModules> <add name="CustomHttpModule" type="MyCustomHttpModule"/> </httpModules> </system.web> </code></pre> <p>...and for IIS 7+</p> <pre><code><system.webServer> <modules runAllManagedModulesForAllRequests="true"> <add name="CustomHttpModule" type="MyCustomHttpModule"/> </modules> </system.webServer> </code></pre>

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