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Can't see path to another server in ASP.NET MVC

I have an internal ASP.NET MVC site that needs to read an Excel file. The file is on a different server from the one that ASP.NET MVC is running on and in order to prevent access problems I'm trying to copy it to the ASP.NET MVC server.
It works OK on my dev machine but when it is deployed to the server it can't see the path.
This is the chopped down code from the model (C#):
string fPath = HttpContext.Current.Server.MapPath(#"/virtualdir");
string fName = fPath + "test.xlsm";
if (System.IO.File.Exists(fName))
{
// Copy the file and do what's necessary
}
else
{
if (!Directory.Exists(fPath))
throw new Exception($"Directory not found: {fPath} ");
else
throw new Exception($"File not found: {fName } ");
}
The error I'm getting is
Directory not found:
followed by the path.
The path in the error is correct - I've copied and pasted it into explorer and it resolves OK.
I've tried using the full UNC path, a mapped network drive and a virtual directory (as in the code above). Where required these were given network admin rights (to test only!) but still nothing has worked.
The internal website is using pass through authentication but I've used specific credentials with full admin rights for the virtual directory, and the virtual dir in IIS expands OK to the required folder.
I've also tried giving the application pool (which runs in Integrated mode) full network admin rights.
I'm kind of hoping I've just overlooked something simple and this isn't a 'security feature'.
I found this question copy files between servers asp.net mvc but the answer was to use FTP and I don't want to go down that route if I can avoid it.
Any assistance will be much appreciated.

First, To be on the safe side that your directory is building correctly, I would use the Path.Combine.
string fName = Path.Combine(fPath, "test.xlsm")
Second, I would check the following post and try some things there as it seems to be a similar issue.
Directory.Exists not working for a network path
If you are still not able to see the directory, there is a good chance the user does not have access to that network path. Likely what happened is the app pool running your application has access to the directory on the server. The production box likely doesn't have that same access. You would have to get with the network engineer to get that resolved.
Alternatively, you could write a Powershell script to run as a user who has access to both the production and the development server to copy the file over to the production server if that is your ultimate goal and your server administrators could schedule it for you if that is allowed in your environment.

How to write to an iSeries FileShare from ASP.Net

I've written an asp.net webapp that writes a file to a location on our iSeries FileShare.
The path looks like this: \IBMServerAddress\Filepath
This code executes perfectly on my local machine, but fails when it's deployed to my (windows) WebServer.
I understand that i may need to do some sort of impersonation to authenticate access to the IFS, but i'm unsure of how to proceed.
Here's the code i'm working with:
string filepath = "\\\\IBMServerAddress\\uploads\\";
public int SaveToDisk(string data, string plant)
{
//code for saving to disk
StreamWriter stream = null;
stream = File.CreateText(filepath + plant + ".txt"); // creating file
stream.Write(data + "\r\n"); //Write data to file
stream.Close();
return 0;
}
Again, this code executes perfectly on my local machine but does not work when deployed to my Windows WebServer - access to filepath is denied.
Thanks for your help.
EDIT: I've tried adding a network account with the same credentials as the IFS user, created a UNC path (iseries)on IIS7 to map the network drive (using the same credentials) - but receive this error:
Access to the path 'iseries\' is denied.

My understanding of Windows in general is that normally services don't have access to standard network shares like a program being run by a user does.
So the first thing would be to see if you can successfully write to a windows file share from the web server.
Assuming that works, you'll need one of two things in order to write to the IBM i share..
1) An IBM i user ID and password that matches the user ID and password the process is being run under
2) A "guest account" configured on IBM i Netserver
http://www-01.ibm.com/support/knowledgecenter/ssw_ibm_i_71/rzahl/rzahlsetnetguestprof.htm
You might have better luck with using Linux/UNIX based Network File System (NFS) which is supported in both Windows and the IBM i.

Allow write permissions for .NET application

I've been running in circles with allowing my application to write to a folder on a shared network drive.
So far I have this:
FileUploadControl.SaveAs(Server.MapPath("myFolder/" + filename));
this successfully saves the file to
\\machineName\inetpub\wwwroot\myApp\myFolder
However, I am also trying to save the same file to a folder outside of the root folder on the path
\\machineName\myFolder
using:
FileUploadControl.SaveAs("C:\\myFolder\\" + filename);
This returns an error of "Access Denied." So how do I go about allowing my application to write a file to \\machineName\myFolder? I have tried giving write permissions to IIS_IUSRS and NETWORK SERVICE to no avail. Should I create a user with privileges to write to the network drive and then use impersonation to use that user when writing to the drive?
Using IIS 7 with .NET 4 application.

Go to your application's app pool, right click on it and choose Advanced properties. Check the Identity value under Process model settings group. Give this Identity permissions to write files in your folder.
If the value is ApplcationPoolIdentity than user name is IIS APPPOOL\app_pool_name.

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.

Access denied to path , when uploading image to folder in server

Am getting error when you are going to upload the file on specified folder in the server. Here I am going to upload P6100083.jpg in storeimg folder. When I am going to upload I am getting the following error:
Access to the path 'C:\inetpub\vhosts\bookmygroups.com\httpdocs\storeimg\P6100083.jpg' is denied.
Can anyone help me... How to use permisiion and were to use...
My code is while uploading image
if (FileUpload1.HasFile)
{
float fileSize = FileUpload1.PostedFile.ContentLength;
float floatConverttoKB = fileSize / 1024;
float floatConverttoMB = floatConverttoKB / 1024;
string DirName = "storeimg";
string savepath = Server.MapPath(DirName + "/");
DirectoryInfo dir = new DirectoryInfo(savepath);
// string savepath = "C:\\Documents and Settings\\ssis3\\My Documents\\Visual Studio 2005\\WebSites\\finalbookgroups\\" + DirName + "\\";
if (fileSize < 4194304)
{
string filename = Server.HtmlEncode(FileUpload1.FileName);
string extension = System.IO.Path.GetExtension(filename).ToUpper();
if (extension.Equals(".jpg") || extension.Equals(".JPG") || extension.Equals(".JPEG") || extension.Equals(".GIF"))
{
savepath += filename;
FileUpload1.SaveAs(savepath);
}
}
}
Thanks in advance

I have no success making my upload or any write operation on filesystem work on IIS7.
Still getting the error: Access to the path is denied.
My AppPool is running under Network Service. I have granted all kinds of accounts Full Control (Network Service, Network, IIS_IUSR, Administrator, Users, Everyone), restarted the webservice several times, studied all IIS7 settings, googled for two hours and nothing works.
IIS7 and WS2008 s-u-c-k-s. Sorry for the term. Anybody can help?
I just wanted to add: I noticed that in the upload's destination folder's Properties there's this checkbox named "Read-only (Only applies to files in folder)" and it's checked. It cannot be unchecked, comes back checked after unchecking and clicking the OK button. Is that IIS7 guarding it?
Editing this message to add the SOLUTION: My admin has turned off the silly UAC "the security confirmation feature" on our server, restarted the machine and it works now. No "write" access rights for "Network Service" or any other IIS-used account was needed. When accessing the file system in a ASP.NET web application using the integrated authentication and having the impersonation set to true in its web.confing, the file system seems to be accessed by the authentified end-user's account, not by the Network Service account which the AppPool is running under. (Many people tell you to set Network Service permissions, but that is not true.) So you need to set the "write" permissions for your end-users (usually domain users: "DOMAIN\domain users") on your particular folder.
Oh yea, and the "Read-only (Only applies to files in folder)" checkbox mentioned above does not seem to have any effect. However Microsoft says "some programs might have problems writing to such folder and you should use command line statement "attrib -r -s" to get rid of the Read-Only attribute" -- but it won't work. It will stay there checked-grayed. But don't worry about that. Microsoft becomes more and more silly every day.

Indead, it's a server issue.
You need to verify if the user underlying your application pool has write access to the directory.
If you use IIS7, you have a new feature that helps you give custom write to this user and dun need to change the user.
Look at this link:
http://www.adopenstatic.com/cs/blogs/ken/archive/2008/01/29/15759.aspx
Hope this helps.

This is a server issue. Make sure you have the necessary rights to write files.
Btw, since you call ToUpper() on extension there's no reason to test for ".jpg".

If you are using Plesk Panel, go to file manager of Plesk Panel. List files and folders inside "httpdocs". Each file and folder has a lock icon at the very right. Click that of "storeimg" folder to change permissions. Click advenced button. Give full permission to these:
Plesk IIS WP User (IWPD_214(your_login_name))
Plesk IIS WP User (IWPD_214(your_login_name))
And click OK.

First you check the permission is enable or not if not then go to that folder which folder has to be use for containing files then right click on folder then there will be display folder properties then click on security there will be display multiple number of user which user have to be permit then click allow that all permission will be activated.

First, make sure your code runs fine locally (I assume that something you've already done).
Then deploy to your TEST or UAT environment. If you're having issue there, then this is a configuration issue. Make sure the service account under which your website's app pool is running has access to the folder.
Please make use of C# method Path.Combine() to build up your path and avoid issues with leading or trailing / and \.