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I have enabled the Failed Request Tracing in IIS 10. If I'm disabling the allow unlisted file name extensions within the request filtering, then the failed request logs are generated. I can only see the 404 status, but there is no information about the blocked extension.

ModuleName: RequestFilteringModule 
Notification: BEGIN_REQUEST
HttpStatus: 404 
HttpReason: Not Found 
HttpSubStatus: 7 
ErrorCode: (0x0)

How can I get information which file extension has been blocked (to allow this extension)?

Phoniex
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  • Isn't the URL enough? – Lex Li Oct 16 '20 at 00:00
  • I'm just getting **https://example.com/account/login** and no more information about the blocked extension. – Phoniex Oct 16 '20 at 05:30
  • I have created the list of used extensions as discussed their [link](https://stackoverflow.com/questions/64370587/iis-list-of-common-file-extensions-request-filtering?noredirect=1#comment113849225_64370587) but the website is offline and I can't find any logs showing which exentsion is missing – Phoniex Oct 16 '20 at 09:47

1 Answers1

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Sure. When that's the URL, the extension being blocked is simply .. You have to explicitly allow . or it will be blocked. I blogged about it a decade ago, https://docs.microsoft.com/en-us/archive/blogs/lexli/iis-7-dot-tricks-part-ii

Lex Li
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