Creating a virtual directory failed with the error

问题

I can't solve this problem

I suggest I have to change c:\Windows\System32\drivers\etc\hosts file and add after

# localhost name resolution is handled within DNS itself.

the next line:

127.0.0.1       mysite.dev

but it doesn't help. Any suggestions?

Error ocсurrs when I try to open web site project in Microsoft Visual Studio 2012.

回答1:

More often than not, at least in my case, this happens is when a *.csproj.user file is in the project directory and has <UseIISExpress>true</UseIISExpress> in it.

Alternatively, as mentioned by Zachary Cutler you can also simply: close Visual Studio, delete the *.csproj.user file and reopen Visual Studio. This will force VS to rebuild the file.

回答2:

I've already found the solution. I just had to edit C:\Users\Administrator\Documents\IISExpress\config\applicationhost.config file, by adding my site to <sites> node.

回答3:

You can opt to install IIS locally and edit a couple of tags on .csproj File. Open you csproj file and go to section <VisualStudio> then find tag <UseIIS>True</UseIIS> it must be set as true, then go to tag: <IISUrl> and set up with the URL address where the application will be hosted for testing:

<VisualStudio>
      <FlavorProperties GUID="{349c5851-65df-11da-9384-00065b846f21}">
        <WebProjectProperties>
          <UseIIS>True</UseIIS>
          <AutoAssignPort>False</AutoAssignPort>
          <DevelopmentServerPort></DevelopmentServerPort>
          <DevelopmentServerVPath>/</DevelopmentServerVPath>
          **<IISUrl>http://localhost/myWebSiteAppSample</IISUrl>**
          <NTLMAuthentication>False</NTLMAuthentication>
          <UseCustomServer>False</UseCustomServer>
          <CustomServerUrl>
          </CustomServerUrl>
          <SaveServerSettingsInUserFile>False</SaveServerSettingsInUserFile>
        </WebProjectProperties>
      </FlavorProperties>
    </VisualStudio>

And that is. Now you can load your project normally.

回答4:

The problem would be your project setup to be executed in the local IIS and the URL specified not exist.

There are options you can do to fix the problem.

Option 1 : (Use IIS Express)

1.) Open you web project .csproj file as XAML or in notepad.

2.) Find these properties and set according to your preferences.

UseIIS = false

UseIISExpress = true

and that's it.

Option 2 : (Use local IIS)

Follow the option 1 steps but change the following properties.

UseIIS = true

IISUrl = https://localhost

UseIISExpress = false

回答5:

The issue can be fixed by deleting the folder named .vs in the project directory.

This solves the problem because while opening the project after deleting the .vs file, it creates the same folder with subfolder config and folder with project name.

The config folder applicationhost contains the necessary settings required to run the project successfully.

回答6:

I just went to the directory named in the error and renamed the applicationhost.config and restarted and VS created a new file and ran fine.

回答7:

I don't know why, by my applicationhost.config file was completely missing from my C:\Users\Administrator\Documents\IISExpress\config\ folder.

Copy/pasting C:\inetpub\history\applicationhost.config into that folder seemed to fix the problem for me.

Got the idea from here.

回答8:

1. Turn on windows features "Internet Information Services" in control panel.
2. Open ".csproj" file and find
3. Modify this line based on your requirements. http://localhost:777/
4. Open the project/solution now
5. If failed to load again, just right click the solution and select "Reload Project".

回答9:

I know this is probably a rare occurrence, but figured I'd put it here:

My csproj file was set to "read only" (Don't ask me how I managed that), but after I turned off "read only" access, everything was fine. (VS2017)

回答10:

I was facing the same issue because of my network password changed.I changed my NetExtendor login password but I have to login in my laptop with old password.

Try these steps to fix this issue:

log into the Computer with whatever password works log into vpn with whatever password works ctl-alt-del to lock the pc then use the new password to unlock it

It worked for me :-)

Thanks!

回答11:

Not the exact same error, but I was lead to this answer since the first half of the error matched. Your applicationhost.config file may simply be read-only. Taking that off solved the error for me. That error calls out the file specifically though, so you should be able to find it easily.

回答12:

My issue was with Windows 10 Defender. I had given IIS permission in the past, but seems like it is now ignoring it. Will look into it later, but for now I disabled controlled folder access and it worked.

回答13:

• Tried several approaches mentioned in the answers, but what finally worked for me was swapping the <IISUrl> of .csproj with <CustomServerUrl>.

Edit :

• The above didn't solve the root cause of the issue for me. However, If you've done a windows update recently, perhaps it might be the reason that's causing the issue. Try executing netsh http add iplisten 0.0.0.0 and see whether it solves the issue.

Hope these would help someone still looking for a way.

回答14:

I wanted open an exiting project of Visual Studio 2017 in VS 2019 and encountered with the same issue. I find its a version related problem. The solution is: Create a new project in the newer VS and copy the codes from the older VS.

回答15:

So here are the steps to fix it:

1. Go where your .csproj file is. This is usually one directory below the solution (.sln)
2. Right click and open with a text editor (notepad)
3. Find IISUrl tag and replace its content for http://localhost:(YourPortNumber)
4. Save and reload your project!

来源：https://stackoverflow.com/questions/12170133/creating-a-virtual-directory-failed-with-the-error