i have an application which requires access permission to a file on remote server.
My app is in Server A, and the file i want to access is in Server B. These 2 servers are in the same domain.
I created a virtual directory in Server A for the directory in Server B. The name of virtual directory is FolderFromServerB and its path is \ServerB\Folder. I use a user for auth, and when i test the connection in IIS it says all is OK.
Also, when i put an anchor tag in a test file like below, i can access the file and the content is shown in the page:
Test file --> **This works**
But my problem is when i use code in order to if that file exists or not, it always returns with False. My code is like below:
FileInfo fi = new FileInfo(#"\FolderFromServerB/test.txt"); --> This doesn't work
Response.Write(fi.Exists); --> This always 'False'
I granted 'Full Control' permission to my user& NETWORK SERVICE & Everyone & Administratos in Server B but i didnt work neither.
How can i make it work?
It was working last week. I guess the server updated itself and some updates made that occur, but i couldn't find any workaround. Im so desperate now and i have to change all of my code and spend much time to make it work.
I found the workaround that is in web.config :
<identity impersonate="true" userName="{domain}\{username}" password="{password}"/>
I used File.Exist() for a few months, but then suddenly it was gone and didnt work, and i dont know why. But it is the solution above.
Your code does not work because the current execution folder of an ASP.Net application is not the folder of you application, but c:\windows\system32.
When you create the FileInfo object, you will try to read c:\windows\system32\FolderFromServerB\test.txt.
The <a href="FolderFromServerB/test.txt"> works because the link will be relative to the current page (it won't works if the page is in another directory).
If the file you are looking for is under your application directory, you can convert a virtual to a physical path using :
string actualFilePath = HttpContext.Current.Server.MapPath("~/FolderFromServerB/test.txt");
FileInfo fi = new FileInfo(actualFilePath);
I'm trying to read a file that's just been uploaded to the server, in a newly created folder (folder name is the session id)
Exception Details: System.UnauthorizedAccessException: Access to the
path '...\UploadFiles\jeiqw1qxya33e3r00idwlceo' is denied.
I'm not sure what user to give access to, looking on the net it says to add the identity that the Application Pool runs under, which for me looks to me ApplicationPoolIdentity... but I can't find this user to add to the folder permissions. So I added "everyone" and gave full control... just to experiment mind, and I still get the error above.
This is related to my last question here...
StreamReader with tab delimited text file
using the 'File.ReadAllLines()' method, this is the line that has the exception.
It is not practical to give read access to a folder created dynamically - as you said folder name is session id.
However, you can stream the file back to a user like this.
HttpResponse response = HttpContext.Current.Response;
response.Clear();
response.Charset = "utf-8";
response.ContentType = "text/xls";
response.AddHeader("content-disposition",
string.Format("attachment; filename={0}", fileName));
response.BinaryWrite(File.ReadAllBytes(filePath));
response.End();
If you're running IIS 7.5 or higher the user which your app pool runs with is usually "IIS APPPool{POOL NAME}" where {POOL NAME} is the name of the pool/site.
If you're using IIS 7 with application pool identity I think it's still 'NETWORK SERVICE' that your site runs with.
Btw you can directly see the user that yoru apppool(w3wp.exe) is running in a tool like task manager/process explorer.
Another way to find out which specific account the application is running under is in code: System.Security.Principal.WindowsIdentity.GetCurrent().Name
But if you have given that account, or everyone, full control and you are still getting access denied errors, is it possible that the newly uploaded file is locked? Are you saving the uploaded file to a location that's inside a virtual directory? Sometimes IIS can temporarily lock a file if it's saved to a browsable location. Virus scanners can also sometimes cause file locking.
I'd like to thank everyone for their responses.
When I looked at the code this morning with fresh eyes, I noticed a mistake in my code...
I had...
var records = File.ReadAllLines(Server.MapPath("~/UploadFiles/") + Session.SessionID).ToList();
which points to the folder, and not a target file.
I changed to...
var records = File.ReadAllLines(Server.MapPath("~/UploadFiles/") + Session.SessionID + "/ediFile.txt").ToList();
This now works! It's no wonder this confused me as the permission set up is correct after all! :)
I am having a problem where I am trying to delete my file but I get an exception.
if (result == "Success")
{
if (FileUpload.HasFile)
{
try
{
File.Delete(Request.PhysicalApplicationPath + app_settings.login_images + txtUploadStatus.Text);
string filename = Path.GetFileName(btnFileUpload.FileName);
btnFileUpload.SaveAs(Request.PhysicalApplicationPath + app_settings.login_images + filename);
}
catch (Exception ex)
{
Message(ex.ToString());
}
}
}
Also I should note that the folder I am trying to delete from has full control to network services.
The full exception message is:
System.UnauthorizedAccessException: Access to the path 'C:\Users\gowdyn\Documents\Visual Studio 2008\Projects\hybrid\hybrid\temp_loginimages\enviromental.jpg' is denied. at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) at System.IO.File.Delete(String path) at hybrid.User_Controls.Imgloader_Add_Edit_Tbl.btnUpdate_Click(Object sender, EventArgs e) in C:\Users\gowdyn\Documents\Visual Studio 2008\Projects\hybrid\hybrid\User_Controls\Imgloader_Add_Edit_Tbl.ascx.cs:line 242
Any ideas?
According to File.Delete Method...
An UnauthorizedAccessException means one of 4 things:
The caller does not have the required permission.
The file is an executable file that is in use.
Path is a directory.
Path specified a read-only file.
I also had the problem, hence me stumbling on this post. I added the following line of code before and after a Copy / Delete.
Delete
File.SetAttributes(file, FileAttributes.Normal);
File.Delete(file);
Copy
File.Copy(file, dest, true);
File.SetAttributes(dest, FileAttributes.Normal);
This is an old issue, but I ran into it while searching. Turns out that I was missing the actual filename component in the save path for SaveAs...
string uploadPath = Server.MapPath("~/uploads");
file.SaveAs(uploadPath); // BAD
file.SaveAs(Path.Combine(uploadPath, file.FileName)); // GOOD
When a user tries to connect to your Web site, IIS assigns the connection to the IUSER_ComputerName account, where ComputerName is the name of the server on which IIS is running. By default, the IUSER_ComputerName account is a member of the Guests group. This group has security restrictions. Try to grand access to IUSER_ComputerName to that folder
Here is very good described answer about IIS security
Hope this helps
I got the error because I didn't realize that the destination should be a file. I had a folder as the second parameter (which works in cmd). and I got Unhandled Exception: System.UnauthorizedAccessException: Access to the path is denied. because C# File.Move wants a file there, not just for the first parameter, but for the second too, and so if you put a directory as second parameter, it's trying to write a file like c:\crp when you have a directory called c:\crp.
this would be incorrect File.Move(args[0],"c:\\crp");
So, this would be correct File.Move(args[0],"c:\\crp\\a.a");
The same goes for File.Copy
Right-click on Visual studio and click Run as Administrator
Thanks for +1
If this is an IIS website that is having the problem, check the Identity property of the advanced settings for the application pool that the site or application uses. You may find that it is set to ApplicationPoolIdentity, and in that case then this is the user that will have to have access to the path.
Or you can go old style and simply set the Identity to Network Service, and give the Network Service user access to the path.
You need to modify the privileges of the folder you're trying to delete from/save to. Right-click on the containing folder and use the Security tab to permit modify rights for the user your application runs under.
An UnauthorizedAccessException exception is thrown when the operating system denies access because of an I/O error or a security error.
If you are attempting to access a file or registry key, make sure it is not read-only.
I have also faced this issue when my window service started throwing the exception
System.UnauthorizedAccessException: Access to the path "C:\\Order\\Media
44aa4857-3bac-4a18-a307-820450361662.mp4" is denied.
So as a solution, I checked the user account associated with my service, as shown in below screen capture
So in my case it was NETWORK SERVICE
And then went to the folder properties to check if the associated user account also exists under their permission tab. It was missing in my case and when I added it and it fixed my issue.
For more information please check the below screen capture
same issue for me too,
I was pointing the folder instead of file.
so make sure in path, give path+filename
System.IO.File.WriteAllBytes("path", bytearray);
The exception that is thrown when the operating system denies access
because of an I/O error or a specific type of security error.
I hit the same thing. Check to ensure that the file is NOT HIDDEN.
Check your files properties. If the read-only is checked, uncheck it. This was my personal issue with the UnauthorizedAccessException.
I got this error and solved it in just a moment. Don't know why all of my folders are read-only，I cancelled the read-only and apply it. However, it is still read-only. So I moved the file into the root folder, it works - so weird.
I was facing this error because
Sometimes when I Combine the path with File Name and FileName = ""
It become Path Directory not a file which is a problem as mentioned above
so you must check for FileName like this
if(itemUri!="")
File.Delete(Path.Combine(RemoteDirectoryPath, itemUri));
I was trying to use System.IO.File.OpenWrite(path)
and it did not work because I was only passing OpenWrite() a path to a directory, but it requires a path all the way to the file you want to write. So a full path including the filename.extension at the end needs to be passed into OpenWrite to avoid UnauthorizedAccessException
In my case the problem was Norton. My in-house program doesn't have the proper digital signature and when it tried to delete a file it gave the UnauthorizedAccessException.
If it give you a notification, you can handle it from there. In my case it didn't give a notification that I noticed. So here's how to keep Norton from blocking the program.
Open Norton
Click the down arrow
Click History
Find activity by program
Click More Options
Click Exclude Process
To solve this problem, I follow the Scot Hanselman approach at Debugging System.UnauthorizedAccessException (often followed by: Access to the path is denied) article, the code with example is bellow:
class Program
{
static void Main(string[] args)
{
var path = "c:\\temp\\notfound.txt";
try
{
File.Delete(path);
}
catch (UnauthorizedAccessException)
{
FileAttributes attributes = File.GetAttributes(path);
if ((attributes & FileAttributes.ReadOnly) == FileAttributes.ReadOnly)
{
attributes &= ~FileAttributes.ReadOnly;
File.SetAttributes(path, attributes);
File.Delete(path);
}
else
{
throw;
}
}
}
}
I had the same problem on a newly moved website on a shared server. Solved through the web host panel (DotNetPanel) setting true the "allow write permissions". So if you are in a shared server before reviewing all code worth taking a look at the server configuration and could save you a lot of time.
Be aware that if you are trying to reach a shared folder path from your code, you dont only need to give the proper permissions to the physicial folder thru the security tab. You also need to "share" the folder with the corresponding app pool user thru the Share Tab
I had the exact error when deleting a file. It was a Windows Service running under a Service Account which was unable to delete a .pdf document from a Shared Folder even though it had Full Control of the folder.
What worked for me was navigating to the Security tab of the Shared Folder > Advanced > Share > Add.
I then added the service account to the administrators group, applied the changes and the service account was then able to perform all operations on all files within that folder.
For those trying to make a UWP (Universal Windows) application, file permissions are much more restricted, and in general is deny by default. It also supersedes the system user permissions. You will basically only have access to files in either
Your install location
Your AppData location
Files selected through the File or Folder picker
Locations requested in your App Manifest
You can read more here for details => https://learn.microsoft.com/en-us/windows/uwp/files/file-access-permissions
If you're using BitDefender there's a good chance its Safe Files feature blocked your operation. This is a form of Ransomware protection that comes with some of its more advanced versions.
Make sure to grant your application access in BitDefender and try again.
Some more details can be found in this BitDefender support page.
In my case it was my AVG anti-virus that triggered the exception.
I added my VS Projects directory to the "Allowed" list. And I had to add the executable to the AVG exceptions list after I copied the .exe to my App directory.
I've had the same problem and I've managed to get it working by changing the partition on which the file will be saved. So, on line 5 I've changed #"C:\" to be #"D:\" and that resolved the problem.
static void SaveVideoToDisk(string link)
{
var youTube = YouTube.Default; // starting point for YouTube actions
var video = youTube.GetVideo(link); // gets a Video object with info about the video
File.WriteAllBytes(#"D:\" + video.FullName, video.GetBytes());
}
After migrating from Visual Studio 2017 to Visual Studio 2019 I faced two exceptions with two of my applications which run properly under Visual Studio 2017:
System.UnauthorizedAccessException
System.ArgumentException
It turned out that I had to add the executables of the two applications to the allowed apps of Avast Antivirus.
I too faced the same problem when trying to do this after deployment at server:
dirPath = Server.MapPath(".") + "\\website\\" + strUserName;
if (!Directory.Exists(dirPath))
{
DirectoryInfo DI = Directory.CreateDirectory(dirPath);
}
string filePath = Server.MapPath(".") + "\\Website\\default.aspx";
File.Copy(filePath, dirPath + "\\default.aspx", true);
File.SetAttributes(dirPath + "\\default.aspx", FileAttributes.Normal);
I granted permission in IIS to other group including administrator and my problem got solved.
In my particular case I was repeatedly creating and deleting 10000 folders. It seems to me that the problem was in that although the method Directory.Delete(path, true) returns, the underling OS mechanism may still be deleting the files from the disk. And when I am starting to create new folders immediately after deletion of old ones, some of them are still locked because they are not completely deleted yet. And I am getting System.UnauthorizedAccessException: "Access to the path is denied".
Using Thread.Sleep(5000) after Directory.Delete(path, true) solves that problem. I absolutely agree that this is not safe, and I am not encouraging anyone to use it. I would love to here a better approach to solve this problem to improve my answer. Now I am just giving an idea why this exception may happen.
class Program
{
private static int numFolders = 10000;
private static string rootDirectory = "C:\\1";
static void Main(string[] args)
{
if (Directory.Exists(rootDirectory))
{
Directory.Delete(rootDirectory, true);
Thread.Sleep(5000);
}
Stopwatch sw = Stopwatch.StartNew();
CreateFolder();
long time = sw.ElapsedMilliseconds;
Console.WriteLine(time);
Console.ReadLine();
}
private static void CreateFolder()
{
var one = Directory.CreateDirectory(rootDirectory);
for (int i = 1; i <= numFolders; i++)
{
one.CreateSubdirectory(i.ToString());
}
}
}
First just check the path if the colon(:) character is missing or not after the drive letter. If colon is not missing then you can check if access/write permission is granted for that path.
I had the same issue and i was only missing the colon, permission and everything else was fine.
C:\folderpath
will work fine but,
C\folderpath .........(missing colon)
will give you access denial error.
I also ran into this post as dealing with the same issue. Looks like the file is in use and hence not able to write to it.
Though not able to figure it out, which process is using it. Signed out the other user who was logged in in that box, dont see any users who is holding it.
Any quick tips regarding on how to find the same.
Thanks,
Lakshay (developer)
I use asp.net fileupload control to upload files but it is work on localhost not work on remote server i use this line of code to do this but it is not work when i publish the page to server
FileUpload1.PostedFile.SaveAs(Server.MapPath("products_images/")
+ FileUpload1.PostedFile.FileName);
please help me
Make sure of the following.
1) The directory exists on the remote server.
2) You have write permissions to the directory.
Also, do you get any exception? check your event logs on the server for any errors.
I face the same problem with shared host [GoDaddy].
the problem comes from that you don't have the permission to access the files.
so please check the permission to write file in the remote server.
If you are not using a hard coded path then it will be a file permission issue, you can access the cpanel of your hosting and give the iis user the permisssion to write files on the folder where you put your files.
Try to enter the absolute path of the remote directory.
I had this problem before, and solved by using an absolute path (e.g. \192.168.11.72\Images)