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Asked: 2026-05-10T19:05:52+00:00

On a .Net production server, I am unable to look at the Application trace.

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On a .Net production server, I am unable to look at the Application trace. The web server returns a 404 error. When copying the files on my local computer, the trace works, making further testing impractical.

The trace seems to be correctly set:

<trace enabled='true' requestLimit='20' pageOutput='true'  traceMode='SortByTime' localOnly='false' />

edit:

crap, I was trying to reply to it directly since I lost 2 hours on that and that some googling showed I was not the only one who stumbled there. Apparently I can’t accept my own answer 🙂

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1 Answer

  1. First of all, check whether the trace works whith a minimal trace directive:

    <trace enabled='true' />

    should work in any case.

    Then check the IIS configuration: an URL rewriting rule might be interfering with the trace.axd url.

    If this is not the case, check whether the server accepts the .axd extension (Manage IIS>Properties>Home Directory>Configuration: The .axd extension should be present, executed by aspnet_isapi.dll, and not verifying that the file exists)

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