I don't know why this is happening for you; if the UrlTracker doesn't find any records matching the request, it doesn't touch the Response, so it's like it's not their at all.
I'm afraid I can't help you with this (I haven't ran into this issue btw).
For anyone else that finds themselves here - add this to your web.config and all is well!
IIS 7.5+
You may find that you don't get your error pages and IIS takes over. To get Umbraco to handle your errors for 404 insert the following element before the end of the system.webServer section of the web.config.
existingResponse="PassThrough"/>
Now the 404 error you configured in the umbracosettings.config should display.
Custom 404 Page
I'd previously configured a custom 404 page - after installing 301 URL Tracker this no longer is shown (I see the default windows server 404 page).
Is it possible to change this either redirecting to an Umbraco node or a static HTML file?
I don't know why this is happening for you; if the UrlTracker doesn't find any records matching the request, it doesn't touch the Response, so it's like it's not their at all.
I'm afraid I can't help you with this (I haven't ran into this issue btw).
I need to RTFM! http://our.umbraco.org/wiki/install-and-setup/configuring-404-pages ;
For anyone else that finds themselves here - add this to your web.config and all is well!
IIS 7.5+
You may find that you don't get your error pages and IIS takes over. To get Umbraco to handle your errors for 404 insert the following element before the end of the system.webServer section of the web.config.
existingResponse="PassThrough"/>
Now the 404 error you configured in the umbracosettings.config should display.
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