Saturday, June 30, 2007

Which W3WP.EXE to Debug ?

Here is the scenario. Some Web Service program runs in IIS 6.0 having cryptic error, and you have to figured it out using MS Visual Studio 2003 debugger. As you may all already know, to debug some Web Application Process in remote computer, you have to debug process that is resides in W3WP.EXE.

Well, after you fire out the Debug Process screen, to your dismay, you found more than one W3WP.EXE with different Process ID. The question is, which W3WP.EXE to be the debugger attached to ?



You can find it using command line utility called IISApp :



The AppPoolId refers to the Application Pool where your web application resides. Usually it resides in DefaultAppPool. To verify that your application is indeed resides in certain Application Pool, you can use IIS Manager 6.0 snap in :



In the above example, the gear below the "DefaultAppPool" is all of the web application that resides in that particular Application Pool.

After determining which application pool that your web application resides, you can write down the PID shown by IISApp, and perform the right choose, and hence, your debugger will break to your desired location.

Whereas about precisely how you do the debugging, you can consult another posting in this blog. Wish you a happy web service debugging :) !

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Anonymous said...

What I don't get is how this is useful when the w3wp thread gets recycled in the middle of debugging and in my experience the symbol files are not being built. Yes, I have debug set to true in the config. This is, btw IIS7 on Windows 2008.

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