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I have a file share on a remote PC, read only, guest access is on. I'm trying to read a file from that share via its UNC path, from a desktop app, using the code like this: var bytes = File.ReadAllBytes(@"\\someservser\someshare\somefile.txt");, but getting the following exception:

System.IO.IOException
  HResult=0x80070569
  Message=Logon failure: the user has not been granted the requested logon type at this computer.

  Source=<Cannot evaluate the exception source>
  StackTrace:
<Cannot evaluate the exception stack trace>

  This exception was originally thrown at this call stack:
    System.IO.__Error.WinIOError(int, string) in __error.cs
    System.IO.FileStream.Init(string, System.IO.FileMode, System.IO.FileAccess, int, bool, System.IO.FileShare, int, System.IO.FileOptions, Microsoft.Win32.Win32Native.SECURITY_ATTRIBUTES, string, bool, bool, bool) in filestream.cs
    System.IO.FileStream.FileStream(string, System.IO.FileMode, System.IO.FileAccess, System.IO.FileShare, int, System.IO.FileOptions, string, bool, bool, bool) in filestream.cs
    System.IO.File.InternalReadAllBytes(string, bool) in file.cs

I can open this file from Windows UI without any problem (same user as used to run the failing app).
Any ideas?

user626528
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  • The error in code not even mentioned in the question - I bet you trying to do it from server side code. Please [edit] question with details... (or delete you are not the first on to hit "ntlm one hop hell") – Alexei Levenkov Sep 09 '20 at 19:07
  • Are you running the program with Administrator rights? I often lose access to network shares from within a program when I run it as Administrator. – Greg Sep 09 '20 at 19:07
  • @Alexei Levenkov it has nothing to do with any kind of ASP.Net at all. – user626528 Sep 09 '20 at 19:11
  • @Greg no, simple non-elevated app. – user626528 Sep 09 '20 at 19:11

1 Answers1

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you can try the approach below (with credentials)

using (new NetworkConnection(@"\\someservser\someshare", readCredentials)){
   var s = File.ReadAllBytes(@"\\server\read\file\somefile.txt");
}

and check this address for NetworkConnection implementation

EDIT: for the "Logon failure: the user has not been granted the requested logon type at this computer.” error, try the steps below

  • On the Telnet server, open the Group Policy Management Editor. To do so, click Start, then in the Start Search box, type gpedit.msc, and then press ENTER.

  • If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then click Continue.

  • In the navigation pane, open Computer Configuration, Windows Settings, Security Settings, Local Policies, and User Rights Assignment.

  • In the details pane, double-click Allow log on locally.

  • Click Add User or Group.

another option is to give access to everyone user so that you won't need to login.

but again the best way is to create a local account for this particular purpose

Derviş Kayımbaşıoğlu
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