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Access to path denied on IIS

I'm trying to get my MVC app to write a simple text file to another server using System.IO.File.WriteAllText. (A separate process is looking in that folder for text files to grab.) It works fine when debugging on my local machine, but when deployed to IIS on a test server, I always get this error when trying to write the file:
Access to the path '\\server\C$\folder\subfolder\file.txt' is denied.
The answer to at least half a dozen similar questions here on SO was to give the application pool identity account access to that folder. However, the app pool on IIS was already running under a service account that had full permissions to the desired folder but was still getting the error. I even tried changing the app pool to my own account (the one used successfully in debugging) and still get the error.
Anonymous access is turned off, and Windows Authentication is turned on (part of the file.txt is info from the user's AD account). I have tried accessing the app with several AD accounts, both with and without access to \\server\C$\folder\subfolder\ but they all give the same error.
I don't see how the app can be running under an authorized account, and the user can be logged in to the app with an authorized account, but still get the access denied error. Is there any way to get more info about specifically what access is denied or which account is actually being denied? Anything else I'm missing here??

You need to check whether other processes already have the file open, e.g, "A separate process is looking in that folder for text files to grab" - perhaps this separate process already has the file open and is therefore locking out your IIS process? Use Process Monitor (https://learn.microsoft.com/en-us/sysinternals/downloads/procmon) to monitor activity on the file.
Also you give the file location as '\server\C$\folder\subfolder\file.txt'. UNC paths normally begin with a '\\', e.g., '\\server\C$\folder\subfolder\file.txt'. That may just be an artefact of StackOverflow escaping the double slash to a single slash.
As a simple test, can you use notepad with your own account to open the file in the error message and write to the file? What if you use the application pool identity account?
Edit: You run Process Monitor on the server that has the file location. Add a Path filter like this:
Path excludes file.txt then Exclude
Where file.txt is the file name (without the directory) of the file you are monitoring. This filter will only capture events for that file and will exclude everything else. Once an event occurs, right click it, and go to Properties, Process to see the User initiating the event.

First of all, you can try to give write rights to IUSR user on your folder in which you want to write your text file.
There is a way to imitate an user in your asp.net application by using Impersonate tag in your web.config file but I think this can be dangerous.
<identity impersonate="true" userName="nomducompte" password="motdepasse" />
I hope this helps.

Getting error while running ASP.NET Website on Local Host Server

I'm running a web application developed on ASP.NET; C# and SQL Server 2008; on Local Host on a Network.
It is showing an error 500.19 for some Permissions...
Can anyone help me out to solve this and run my website on localhost without hosting it online.....Have a look, What's the error is...

It might be the issue of permissions for the directory/files for your application.
Make sure you have given the full permission to the users types that will be accessing the application.
For adding/editing permissions, you can navigate to the concerned folder and right click on it, selec properties and then go to security tab wherein you can edit the permissions of existing users as well as add new users with specific permissions.
Also, if you have your application hosted on IIS, there is also an option for changing permissions which will again, open the folder for you and you will have to follow the same steps as mentioned above.
Hope this helps.

Such issue occurs when, some wrong or duplicate element added in web.config file.
Verify your web.config file.
Also confirm execute version of virtual directory (32 Bit / 64 Bit)

Deploying my visual studio web application using IIS

I have publish my website at visual studio . and i try to setup a website by IIS .
What i have done is :
I click Add New Website in ' Sites ' folder in the IIS and when i browse my physical path and pool , there is always the error saying cannot verify access to path , while my pool authentication passed .
this is my first time publishing a site , i want to host my site on localhost so whenever i type localhost it will be my site without running through visual studio . Can anyone help me with the IIS error on cannot verify acess to path ?
this is the look of my error :

I have just spent a long time trying to get to grips with this myself, and I believe I can offer an answer that may help anyone else who comes across this question in future. I think the problem stems from the terminology that is used in IIS, and the fact that you are just trying to deploy one website to localhost in order to test it.
In IIS, a 'Website' (i.e. what you are adding if you right-click Sites and then "Add Website...") is not really what you would commonly refer to as a website. It is just a folder on disk, with a URL binding. The Default Web Site, for example, has the folder \inetpub\wwwroot, and the binding "http:*:80:" which means that any http request (port 80) will go to this "Website". Your website that you have published is not what IIS refers to as a "Website".
In IIS, an individual website is called an "Application". A "Website" in IIS can hold a number of Applications, and you can add them by right-clicking the Default Web Site and choose "Add Application...".
In other words, the Default Web Site in IIS can contain many websites. For example:
http://localhost/eStellar
http://localhost/otherWebsite
http://localhost/thirdWebsite
all of which may be completely unrelated. I would say that the 3 sites above are 3 different websites, but in IIS these are three "Applications" contained within the "Default Web Site".
In IIS, each "Website" must have a unique binding. As you want your website to be accessible from
http://localhost/eStellar
(which is port 80) you should use the IIS Default Web Site, because it has the binding already to port 80 and you cannot create another "Website" in IIS with that same binding.
So right-click on the Default Web Site, and choose "Add Application...". In the dialog box that appears, the Alias is the name that you want to use in the URL after localhost, so in your case this is "eStellar". The Application Pool can be anything, but just choose the DefaultAppPool for now (the choice of Application Pool is another issue entirely). In the Physical Path, enter the place where you published the website to (i.e. what you have in the Physical Path box in the image in your question).
I also get the same "Cannot verify access to path" warning that you show in your image, but this does not affect my ability to access the page at
http://localhost/eStellar
It appears to be saying that it "cannot verify" whether you have access, not that it definitely cannot access the site. This warning was a bit of a red herring for me, as it actually has nothing to do with why I could not set up the site with the same method as you state in your question.
Hopefully now you can access your site at localhost.

These are the steps that need to be done on IIS 7
Right click your default website
Click on add application.
a dialogue will appear you need to give alias and folder path to your application here. along with application pool.
and you are good to go.
Regarding your error, give your login user rights, And if you are using connect as provide the user name and password of your machine to see if your test is successful.

"CS0016: Could not write to output file" error when starting an app in IIS 7

I am running Windows 7, and am not usually a developer in this setting, and have recently built a WCF Rest Service in C#, that I'm now trying to deploy to IIS just on my local machine. After much wrangling, I setup up the application, but when I navigate to the application, I get an error message:
Compilation Error
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.
Compiler Error Message: CS0016: Could not write to output file 'c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\scom_sibyll\8c0b945e\9329016\App_global.asax.eagmqgcd.dll' -- 'Access is denied. '
I have hunted the web to the best of my ability, and have changed the permissions on the Temporary ASP.NET Files fodler to allow the Network Service account full rights, and done the same with the Temp folder. It copies a number of files before failing, so it has write permissions presumably, so I checked the permissions to read from my source folder, and that is working as well. I additionally noted it's crapping out when it tries to to cache the DLL file, and tried turning off my Antivirus protection, as well as turning off UAC, just to see if I could figure out what is blocking this from occurring. I'm fresh out of ideas now. Anybody have any suggestions?

For those looking here as I did, if the accepted answer doesn't resolve the issue you might try following this article: http://lordzoltan.blogspot.com/2011/02/aspnet-2-and-4-default-application-pool.html
In summary, it seems that the same error is sometimes displayed when the app pool user doesn't have access to the %TMP%/%TEMP% folder.
You'll need to grant IIS_IUSRS read and modify access over the temp folder of the user the app pool is running as.
This could either be the temp folder in the app pool user's profile, e.g. c:\Windows\ServiceProfiles\NetworkService\AppData\Local\Temp, or the system temp folder at c:\windows\temp.
Setting this up this resolved the issue for me.

Sounds like the account that the WCF service is running under does not have access to write to the "Temporary ASP.NET Files" directory.
You could also try re-running regiis.
%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_regiis -i
ASP.NET IIS Registration Tool (Aspnet_regiis.exe)

On Windows 8/Server 2012 there is no support for aspnet_regiis any more.
I tried reinstall using windows features: fail.
I tried reinstalling IIS: fail.
I tried reinstall through WebPI: fail.
I solved the issue by setting the ACL's on the Windows Temp Directory.
Here is a powershell that does the job:
$dir = "C:\Windows\Temp"
$acl = get-acl -path $dir
$new = "IIS_IUSRS","Modify","ContainerInherit,ObjectInherit","None","Allow"
$accessRule = new-object System.Security.AccessControl.FileSystemAccessRule $new
$acl.SetAccessRule($accessRule)
$acl | Set-Acl $dir

There're 3 step to do:
1 - check if "Application Pool Identity" is NetworkService
2 - NETWORK_SERVICE account needs full control on:
. C:\Windows\Temp
. C:\Windows\Microsoft.NET\Framework[related framework]\Temporary ASP.NET Files\
3 - restart the IIS
Error Solved
You could also try re-running regiis.
"%windir%\Microsoft.NET\Framework[related framework]\aspnet_regiis -i"

This KB resolved it for me, it appears that the temp file path was nonexistent in the OS environmental variables.
http://support.microsoft.com/kb/825791

I granted read and write access to C:\Windows\Temp for the IIS_WPG group. This worked for me. I'm on Server 2003 R2 and IIS 6 and the group name is different. I fount it from http://learn.iis.net/page.aspx/140/understanding-built-in-user-and-group-accounts-in-iis/ where it says:
•The IUSR built-in account replaces the IUSR_MachineName account.
•The IIS_IUSRS built-in group replaces the IIS_WPG group.
Thanks to Dommer for suggesting the windows temp folder and to zcrar70 for the nice summery and a link with detailed description.

For me the solution was a combination of the fixes described here. I had to give to the NETWORK_SERVICE account full control on
C:\Windows\Temp
and
C:\Windows\Microsoft.NET\Framework[related framework]\Temporary ASP.NET Files\
and also change the Application Pool Identity to NetworkService.
Also do not forget to restart the IIS after you give full control to NETWORK_SERVICE on the Temp folders

I was getting the same error while developing a web api using asp.net core 2.0 and it got resolved after restarting the machine.

Some times the Temp files might be locked by other process in the workstation. As a first step please reboot the workstation and check the application.

On Windows 8 absolutely nothing worked for me. One day app pools suddenly decided they no longer want to work under the NetworkService account.
I solved the problem by changing the app pool to work under my own user account. Not a great solution I know, but it worked.

This error happens when I use a bat file to delete temporary files. It probably deletes the directory itself and the given permissions are gone. So you have to restore them somehow.
The easiest way is to grant full control over following directories for Everyone:
C:\Windows\Temp
C:\Windows\Microsoft.NET\Framework[related framework]\Temporary ASP.NET Files\

I have permissions but I'm starting to get that error.
"restart machine" works for me

I started getting this error too recently in a corporate environment after the company implemented various security measures that took away admin rights from the users.
For developers, the company authorized the creation of accounts that could be used and we had to add these to the PC's admin group and then change the application pool's identity to use the account.
EXAMPLE (Windows 10)
Account created for developers: domain\developer
Someone with admin rights to the PC will have to do the following:
Go to Control Panel\User Accounts\Manage User Accounts
Click on the Advanced tab, and click on the Advanced user management button
In the lusrmgr page, click on the Groups folder in the left column to bring up groups in the center panel
Then secondary-click on the Administrators group and select "Add to Group..."
In the Administrators Properties panel, click the "Add..." button
A "Select Users, Computers, Service Accounts, or Groups" dialog opens. Add the account (domain\developer in this example)
Then click on the OK button (this button will be disabled if you don't have admin rights)
Now configure the App Pool:
Open IIS Manager, select Application Pools
Click on the application pool you want so it's highlighted, then click "Advanced Settings..." from the Actions panel on the right
Under the Process Model section, click on the Identity setting and the ellipses button
In the Application Pool Identity dialog, select "Custom account" and then click the Set button
Enter the account and the password
At this point I was able to close everything, restart IIS and then run my app. It could then access the temp folders it couldn't before.

In my case, when I change Load User Profile to True (App Pool -> Advance setting -> Load User Profile -> set to true) it works.

Adding C# web app to a web site with IIS6

I finished my very first C# project in VS 2008 and it is working well now. But now I need to publish this project onto my new website. This project is a web application that interacts with my SQL Server 2008 Adventureworks database on this same computer(XP Professional OS). I am running IIS 6.0 Manager, but I am a newbie to both IIS 6.0 and VS 2008.
I began by right-clicking the application in VS and selecting "Publish", but I've just selected File System, cause choosing Local IIS forces me to enter Username and password.
The problem is that I can't open this website from IIS without it prompting me for username and password. I have modified machine.config file several times in the processModel section, by setting username="D610-M\ASPNET", password="AutoGenerate". But this makes me enter built-in password when I try to view it. And I don't know what built-in ASPNET password is. When I cancel this password popup, it returns:
HTTP 401.1 "You are not authorized to
view this page."
And I've reset the ASPNET password several times. First I tried setting it to a password I knew, then I ran the aspnet_regiis command to reinitialize it. I also tried substituting other usernames and passwords, but none of them have worked. I even tried entering "SYSTEM" for username and AutoGenerate password, but even this prompts me to enter password. I have added the ASPNET user Read/Write/List permissions to all relevant folders. And I tried to create a new website pointing to http://localhost/[AppName], but this forces me to enter password. So no getting around that password.
I have modified Properties for Default Website in IIS: Home Directory pointing to my application in VS 2008 folder and Application Protection = Low. On Directory Security tab, I set username to D610-M\IUSR_D610-M and I checked "Enable anonymous access." I unchecked the Allow IIS to control password.
And I have read alot of MS URL's and other websites to see if I could answer these problems myself, but none of their helps worked either. This should be simple. I'm just trying to add my web application to my website. I know that my website works cause I installed a default website with basic HTML and it works.
What else can I try in order to add this web app to my website?

One important limitation to remember is that you are only allowed one website on IIS6 on XP.
If you have edited your machine.config you have introduced too many new variables into the equation to properly troubleshoot the problem (not that editing machine.config in itself is harmful, but it's an indication that there's a bit of shotgun approach to the problem).
You need to start out by wiping your slate clean and making sure that you have an otherwise working system. Browsing an HTML page does not prove much as running HTML and running ASP.NET are like apples and bicycles.
The best that I know of for doing this is uninstalling and reinstalling IIS and whatever .NET framework you are on. If you are on 3.5 you should do this for both two and three point five. If you can you need to put machine.config and every version of web.config (except the one in your web app itself) back to their defaults. There is nothing there you should need to edit run an ordinary ASP.NET app.
Once you think you have a tabla rasa and can browse an html page, then change its extension to .aspx and see if you can still browse it.
My last suggestion for today is:
As a poster above said set your ACLs on the folder where your website is (typically c:\inetpub\wwwroot) so that the group "Everyone" has "Full Access". Don't leave it this way, even on your own machine, but it takes file permissions out of the equation. If you are still having problems let me know, but basically you need to start from a "known good" state if you ever hope to get this problem resolved.

I am not sure if this is it, but.... I have seen this error myself and it is usually caused by not having the ASP.NET version set to 2.0 in your Website properties under the ASP.NET tab. This setting is often defaulted to ASP.NET 1.1 which would cause this error to occur. Note, that even though you are using Visual Studio 2008 the ASP.NET Version is still needs to be 2.0 in IIS. I would double check this setting.

Usually, I recommend the initial build to be to a location in C:\ (example being C:\MyFirstApplication). You also need to make sure the "Network Service" has permissions to that folder. Placing the application in the projects (or whatever) folder in your personal documents list is asking for permissions and access issues. Try that and see if it works!

You need to set root level folder permissions on your web site. Navigate to the folder that holds your web site, right click, permissions, security tab. Make sure that you have asp.net, anonymous user, Internet Guest Account (computer\iuser_{something}) and network service in the allowed roles.
As an aside I suggest that you pre-compile your site before posting it to your web server. This is a security precaution and a performance booster. Getting into this habit will be a good thing for you in the long run. It keeps people from tweaking the code on the server. There is a good utility here to make this easier: http://www.west-wind.com/tools/aspnetcompiler.asp

I believe this is pretty much the same as the question posed by him earlier here