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Access to path is denied in Production, works in Dev

This is frustratingly weird. I'm suddenly getting this error in Production, but not locally in development.
Specs:
.Net Core 3.1
IIS 10
Access to the path '\\[network share]\Files\Video' is denied.
It occurs when this method is called:
public Task<bool> UploadAsync()
{
if (request.Metadata.ChunkIndex == 0)
{
if (!Directory.Exists(request.Metadata.UploadLocation))
{
Directory.CreateDirectory(request.Metadata.UploadLocation);
}
}
var fixedFileName = FileManager.FixFileName(request.Metadata.FileName);
var basePath = Path.Combine(request.Metadata.UploadLocation, PARTIALS);
if (!Directory.Exists(basePath))
{
Directory.CreateDirectory(basePath);
}
var filePath = Path.Combine(basePath, fixedFileName);
AppendToFile(filePath, request.File);
return Task.FromResult(true);
}
... and this line is called:
Directory.CreateDirectory(request.Metadata.UploadLocation)
It seems like it's due to some missing permission with IIS and the web application, since it works when I run the application in IISExpress.
And this is important, the application in both cases is pointing to the same network share location to drop the video file.
So it seems like any permissions on the network share folder is correct, but IIS can't access it. That's my theory, but my network administrator says he hasn't changed anything with the application's app pool, so I don't have any other ideas.
Any ideas what is causing this issue?

According to your description and error codes, it seems this is related with permission issue.
To solve this issue, I suggest you could firstly modify the IIS application pool identity with a user which have the enough permission to access the network share and try again. If this is working well, this is related with the application pool identity account permission.
More details about how to modify the application pool identity permission, you could refer to this answer.

IIS AppPool identity denied access to move file

I have this exact (best as I can see) scenario on a test server and it works as expected.
IIS Application needs to move a file on the D drive from one sub folder to another subfolder
D:\supportfiles\new (file is here)
D:\supportfiles\backup (file needs to be moved here)
I gave the app pool modify access to the top level folder, D:\supportfiles
This works as expected on my test server, but not on a different server that I published to. The app pool has permissions, or at least it appears it does.
I get this error
System.UnauthorizedAccessException: Access to the path is denied.
File.Move(OldPath + FileName, NewPath + FileName);

Go to advance settings of your application apppool and set it to LocalSystem instead of apppool identity. Or setup a new user specially for using in apppool.
It's usually caused for some os hardening issues on product servers.

it happened to me. console application for sure. start as an administrator and try again?

IIS - Access to the path is denied

This question have been asked like million times, but I have tried those solutions and still can't find out why this error is coming up:
Access to the path '\server1\Folder1\Folder2\Folder3\file1.dwg' is denied.
Here is the action which returns the error:
public ActionResult Download(string fileName)
{
fileName = fileName + ".dwg";
string path = Path.Combine(#"\\server1\Folder1\Folder2\Folder3\", fileName);
return File(path, "application/octet-stream", fileName);
}
I have tried to giving permissions to "Folder3" for multiple usernames, for example "SERVER1\NETWORK SERVICE" - Full Control.
Application is running under Default Web Site. Application is running under DefaultAppPool and DefaultAppPool has identity of "NetworkService".
Following code gives identity "NETWORK SERVICE".
WindowsIdentity identity = HttpContext.Request.LogonUserIdentity;
The application was working fine (same download directory) on my own computer, but after deploying this problem showed up.
Server is running Windows 2008 R2 SP1 and IIS 7.5.

Try this:
"Access to the path 'xxxxxx' is denied."
As error says you need to assign permissions to folders
Right Click Folder
Go to Security Tab
Click on Edit
Click on Add
Click on Advanced
Find Now
Give Permission to IIS_IUSRS (Full Control)
Click On OK
Click On OK
Click On Full Control in allow
Click On OK
Again Run the Application
Note: if these steps are not working, then try to give same permission to NETWORK, NETWORK SERVICE users

For my case, I went to the root folder of my project, right clicked on it and opened the properties window and unchecked the Read-only attribute. After clicking OK, all started working.

If anonymous authentication is enabled on your server set read permissions for the IUSR account. To allow access for the application pool identities set read permissions for IIS_USERS group. For UNC-path sure that there are relevant permission for your shared folder (see https://technet.microsoft.com/en-us/library/cc726004(v=ws.11).aspx for details).

Please give the full control permission to your directory. Please do this
-Right click on folder
-Go to security
-From Edit give access to IIS_USERS

Upload files to a remote server

I need to upload files from my asp.net (C#) page residing in the web server to a remote server.
I managed to upload files to remote server from localhost using this code:
string serverPath = "\\\\xx.xxx.xx.xx\\Folder\\" + FileUpload1.FileName;
FileUpload1.PostedFile.SaveAs(serverPath);
But after I published this code to my web server, it stopped working with the error "The network path was not found."
I have looked at a few solutions which suggest using UNC network share and implementing impersonation.
I couldn't figure out how to apply these solutions.
Can someone please give an example, or suggest a simpler solution.
Thanks!!

In FileUpload1.PostedFile.SaveAs(path), path is physical path of file, No Url. You must check:
is Physical folder Exsist?
is You have access to folder?
if answer of both question is true check this code:
string serverPath = #"\\xxx.xxx.xxx.xxx\Folder\";
if (!System.IO.Directory.Exists(serverPath))
System.IO.Directory.CreateDirectory(serverPath);
FileUpload1.PostedFile.SaveAs(serverPath + FileUpload1.FileName);

The account your application runs under must have write permissions to the folder you are trying to upload the file to: \\xx.xxx.xx.xx\Folder\. So you will have to configure the application pool in IIS to run under an account that will have sufficient permissions. Go to the application pool properties in the IIS management console where you will be able to specify an account to be used to run the application. By default it uses a built-in account which won't have any access to shared resources. Take a look at the following article which explains how to do so.

You need a virtual directory on your webserver to upload to. In code you'll have to use Server.Mappath("virtual path") function to get its server path and then save to it.

file upload C# asp.net

i am trying to upload files in asp.net and putting a specific path to be saved. windows user.
it is outputting me an error :
System.UnauthorizedAccessException was unhandled by user code
Message=Access to the path 'C:\Users\USER\Desktop\fyp2\CMS TEST4\CMS\CMS\Upload' is denied.
my code is:
var guid = Guid.NewGuid();
if (File.HasFile)
{
var length = File.PostedFile.FileName.ToString().Length;
var ind = File.PostedFile.FileName.ToString().IndexOf('.');
var sdfs=guid.ToString()+File.PostedFile.FileName.ToString().Substring(ind, length - ind);
File.PostedFile.SaveAs("C:\\Users\\USER\\Desktop\\fyp2\\CMS TEST4\\CMS\\CMS\\Upload");
}

The ASP.NET worker process does not have access rights to that path. By default I believe IIS worker processes run under the Network service account. You can either add write rights for the folder to this account, or set up a new Application Pool with a different identity (i.e. a user that does have write rights).

As simple as the error puts it, your application requires the folder to have proper write permissions.
I'm asuming this is a Web Application. In that case, you'll need that the user which IIS uses to run applications has Write permissions over the specified folder.

The users directory is fairly locked down. If the account the web server is running under is not the specified user, it will not, by default, have access to the path. You can either grant explicit access to that path to the account running your web server, or create a folder with appropriate permissions external to that path and create a link on the user's desktop.

Looks like current user has not permission to save. Before writing try use FileSystemRights with AccessControlType.Allow to know permission info of the destination.