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[GH-ISSUE #9] Web.config error: duplicate ‘mimeMap’ #8

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opened 2026-02-26 21:31:05 +03:00 by kerem · 2 comments

kerem commented

2026-02-26 21:31:05 +03:00

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Originally created by @lfurzewaddock on GitHub (Feb 10, 2018).
Original GitHub issue: https://github.com/ridercz/AutoACME/issues/9

Originally assigned to: @ridercz on GitHub.

To resolve the following IIS error;

Cannot add duplicate collection entry of type ‘mimeMap’ with unique key attribute ‘fileExtension’ set to ‘.’

I needed to add the following line to the generated web.config

<remove fileExtension="." />

Perhaps its worth adding this by default?

<configuration>
  <system.webServer>
    <staticContent>
      <!--
        ACME server requires that the verification file is served either without
        Content-Type header or with "text/json". This setting ensures that.
      -->
      <remove fileExtension="." />
      <mimeMap fileExtension="." mimeType="text/json" />
    </staticContent>
  </system.webServer>
</configuration>

Great work by the way and thanks for the clear step by step instructions!

Originally created by @lfurzewaddock on GitHub (Feb 10, 2018). Original GitHub issue: https://github.com/ridercz/AutoACME/issues/9 Originally assigned to: @ridercz on GitHub. To resolve the following IIS error; > Cannot add duplicate collection entry of type ‘mimeMap’ with unique key attribute ‘fileExtension’ set to ‘.’ I needed to add the following line to the generated web.config `<remove fileExtension="." `/> Perhaps its worth adding this by default? ``` <configuration> <system.webServer> <staticContent>  <remove fileExtension="." /> <mimeMap fileExtension="." mimeType="text/json" /> </staticContent> </system.webServer> </configuration> ``` Great work by the way and thanks for the clear step by step instructions!

kerem closed this issue

2026-02-26 21:31:06 +03:00

kerem commented

2026-02-26 21:31:07 +03:00

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@ridercz commented on GitHub (Feb 10, 2018):

Good idea,

@ridercz commented on GitHub (Feb 10, 2018): Good idea,

kerem commented

2026-02-26 21:31:07 +03:00

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Owner

@ridercz commented on GitHub (Feb 10, 2018):

Fixed in 1.5.2

@ridercz commented on GitHub (Feb 10, 2018): Fixed in 1.5.2

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starred/AutoACME#8

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