Can you describe what happens that you know it is not working?
I have an idea what might be going on, but it depends on your situation.
I would guess that for starters you will want to change the line in your web.config to:
<customErrors mode="Off"/>
So that you can see what errors are occuring on your remote server. If your application_err or() function is generating an exception, I think it will get confusing
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