Why Is Access to the Path Denied

Access to the path is denied

You need to find out from the application pool for the website what is the identity it is running under (by default this is Application Pool Identity) and grant that the correct permissions.

Why Access path denied?

Based on your code, you are either trying to read a Folder since you didn't specify a extension on your File Path here:

private string Inativos = @"C:\Users\Mathias Cruz\Desktop\helloWorld\helloWorld\Consultas";

It will definitely throw a UnauthorizedAccessException error. So make sure you have the exact file path together with its extension.

Access to the path is denied while using FileUploadControl

FileUploadControl.SaveAs requires a full file name, not only the directory as you pass to it.

string SaveLocation = Server.MapPath(@"~\Data\somefile.png");
FileUploadControl.SaveAs(SaveLocation);

Make sure to change the file path every time you upload a file, or the file will be overwritten.

NamedPipeClientStream throws UnauthorizedAccessException: Access to the path is denied

If anyone else runs into this problem I found the cause.
The problem was "UAC remote restrictions". More information can be found in Microsoft's KB 951016

If a local account is a member of the Builtin\Administrators group and authenticates over the network for instance to an SMB share such as \\remotecomputer\C$ or a named pipe, the account will not authenticate as a "full" administrator and thus not have access to administrative resources. Such accounts will have to be elevated from a interactive logon such as RDP to gain full administrative privileges. As such, my scenario with builtin accounts does not work because of this security feature.

There seems to be three ways to handle this problem.

1. Disable this security measure in the registry (probably not recommended).
2. Use a domain account and add that as a local administrator. This security restriction appears to only affect SAM (local) accounts.
3. Only use the builtin Administrator account as this is also not affected by the security restriction.

Note that if the registry is edited incorrectly there might be serious consequences. So backup the registry before performing any changes. The following instructions are based on Microsoft's article on the subject:

To disable the restriction in the registry:

1. Open the registry using regedit and select the following key:
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
2. Create the following key (type DWORD) if it does not exist, otherwise just edit it to have a value of 1: LocalAccountTokenFilterPolicy.

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