CODEWITHSUNDEEP
c#visual-studio-2017iis-8
navarq
navarq

Reputation: 1345

Unable to start debugging on the web server. Operation not supported. Unknown error 0x800040005

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Getting this on Windows 10 Pro, Visual Studio 2017. ASP .NET Framework 4.6

Upvotes: 8

Views: 7435

Answers (4)

sthames42
sthames42

Reputation: 1009

This answer was first described here.

This is most likely a problem with URL Rewrite rules redirecting the DEBUG request Visual Studio sends to the Project Url:

Request URL: https://Project.Url:443/debugattach.aspx
HTTP_METHOD: DEBUG

In our case, all .aspx requests were being redirected to index.aspx so we added this:

<rule name="DebugBypass" stopProcessing="true">
  <match url="^.*$"/>
  <conditions>
    <add input="{HTTP_METHOD}" pattern="^DEBUG$" />
  </conditions>
  <action type="None"/>
</rule>

Worked like a charm.

FYI - Discovered this by turning on Failed Request Tracing for the Project URL and evaluating the trace log.

Upvotes: 1

TheEmirOfGroofunkistan
TheEmirOfGroofunkistan

Reputation: 5654

Another thing to check for, in our case our live config had the DEBUG verb denied:

<security>
  <requestFiltering removeServerHeader="true">
    <verbs>
      <!--disable DEBUG verb-->
      <add verb="DEBUG" allowed="false" />
    </verbs>
  </requestFiltering>
</security>

Upvotes: 0

WhiteleyJ
WhiteleyJ

Reputation: 1691

I had this issue and found that removing a https rewrite rule to force www fixed it for me.

Upvotes: 14

navarq
navarq

Reputation: 1345

Using the task manager to close all Visual Studio processes currently running and restarting visual studio fixed the issue.

Upvotes: 1

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