How to solve error message: "Failed to map the path '/'."

C# Problem Overview

I've searched and searched on Google, and I can't find anything that even seems applicable to my situation, let alone solves the problem. It doesn't matter which address in my website I try to navigate to (even addresses that don't exist give this error instead of a 404), I get the exact same message (the path is always '/'). Any ideas?

Server Error in '/' Application.

Failed to map the path '/'.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.InvalidOperationException: Failed to map the path '/'.

Source Error: 

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace: 


[InvalidOperationException: Failed to map the path '/'.]
   System.Web.HttpRuntime.HostingInit(HostingEnvironmentFlags hostingFlags, PolicyLevel policyLevel, Exception appDomainCreationException) +336

[HttpException (0x80004005): Failed to map the path '/'.]
   System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +11556592
   System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +141
   System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +4813333

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.225

UPDATE: I went back to the site a few minutes after posting this--made no changes to code or configuration--and the error went away. I'm really baffled, but it is no longer a problem.

C# Solutions

Solution 1 - C#

restarting IIS solved the same issue in my case. Seems like something fails in IIS. Didn't worth my panic, either.

IIS 7.5, btw.

Solution 2 - C#

I had the same issue (MVC 4) under IIS 7. It turned out that the App Pool identity didn't have the correct authorization to the site's path.

Solution 3 - C#

You don't have to reset IIS, you can just recycle the app pool.

Solution 4 - C#

Today when I renamed the default website, under which my MVC application was hosted, I started getting that error too. But I restarted IIS and the issue was resolved.

Solution 5 - C#

I also have same issue. In my case working on InstalledSheild / InstalledAware, to make setup of web service. After setup run the above error comes, while resolve issue when check, found that IIs default website path remove after setup run.

So I just add path as below step.

Go to Command prompt -> type InetMgr
Its open IIS, go to 'Default Web Site' -> Advanced Settings (at right side menu)
Go to Physical Path and paste this things - '%SystemDrive%\inetpub\wwwroot' as below

Solution 6 - C#

Just start cmd and run the command iisreset and error will be gone.

Solution 7 - C#

These samples run in server. So either the Windows user must have READ/WRITE permissions or must run the sample in Administrator mode.

Try running the sample in Administrator mode.

Solution 8 - C#

I found that I had misnamed some virtual directories in IIS Manager. After fixing them, I was good.

Solution 9 - C#

The following works for me:

Right click on "Default web site"
Choose Advance settings
Setup Physical Path to C:\inetpub\wwwroot
Click OK.
Browse the Default web site. --> It works.

Solution 10 - C#

This line (top of the stack trace) is telling you there is something wrong which the hosting configuration.

 System.Web.HttpRuntime.HostingInit(HostingEnvironmentFlags hostingFlags, PolicyLevel policyLevel, Exception appDomainCreationException) +336

How is your server set up? Have you checked the config files?

I'd search through them specifically for any settings or attributes which have the single value "/".

Solution 11 - C#

Changing pool from ASP.NET v4.0 to Framework4 worked for me.

Solution 12 - C#

I Think this is because of IIS is unable to find the root folder. i.e wwwroot. Restarting the IIS wont be helpful in some scenarios. if the root path has changed, you should bring it back to %SystemDrive%\inetpub\wwwroot

by right clicking sites node in IIS and changing physical path to the above one.

and make sure that your application pool is asp.net v4.0 and running in integrated mode

Solution 13 - C#

i have tried following solution and it had work for me C:\Program Files\Microsoft Visual Studio 10.0\Common7\IDE\devenv.exe right click on Devenv.exe in Compablity tab --> Privilage Level --> click on Run this Program as an Adminstrator If as for the Admin Password Provide it

if it is already selected deselect it and again select it -->Apply-->OK

restart the VS application and Publish your website again

Solution 14 - C#

I was receiving this error because I happened to be opening a website project over a mapped network drive z:\folder instead of connecting via a UNC path \\server\path\folder. Once I opened the project from the UNC path it built just fine.

Solution 15 - C#

I experienced this after updating to Windows 10 Fall Creators edition version 1709. None of the solutions above worked for me. I was able to fix the error this way:

Go to “Control Panel” > “Administrative Tools” > “IIS Manager”.
Choose “Change .NET Framework Version” from the “Actions” in the right margin.
I chose the latest version shown and clicked “OK”.

If IIS Manager is not available under Administrative Tools, you can enable it this way:

Press the Windows key and type "Turn Windows Features On or Off" then select the search result.
In dialog that appears, check the box by “Internet Information Services” and click OK.

Solution 16 - C#

I had this issue with a specific application and not the entire IIS site. In my case, access to the application directory was not the problem. Instead, I needed to give the application pool a recycle.

I think this was related to how the application was deployed and the IIS settings were set (done via scripts and a deployment agent).

Solution 17 - C#

It could be due to data in your web.config file. E.g. a backslash in a domain username.

userName='domain\user'.

Solution 18 - C#

~I've gone to the Internet Information Services Manager

~Click the sites

~Right click on your website

~Click Manage Website > Advance Settings

~Change the application pool to DefaultAppPool

And it works fine to me.

Solution 19 - C#

I ran into the same issue when trying to run the ASP.Net precompiler, it turned out that I was not opening the command prompt as administrator. Once I did, I was able to run the asp.net compiler successfully.

Solution 20 - C#

My solution was to make sure that all IIS features are installed. So went to add remove programs in the control panel and clicked on add remove windows features and selected all options except IIS 6 console compatibility.

Solution 21 - C#

Executing the command iisreset (cmd with elevated rights) fixed this issue for me.

Content Type	Original Author	Original Content on Stackoverflow
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