ASP.NET application cannot write to folder

Question

I have a .net 2.0 application that I have migrated from a Windows Server 2003/IIS6 to Windows Server 2008/IIS7

This application needs to write to a folder in the public folders section on the server. I have given full rights to:

• Everyone
• IUSR
• NETWORK SERVICE
• IIS_USRS

Still the ASP.NET app cannot write to the folder. The folder is visible in IIS 7 Manager, and it exists on the file system.

Whenever I execute the part of the app that needs to write to the folder I receive the following error:

This worked fine on the previous server, but I cannot figure out how to get it to work on the new server. Please advise.

Solution

In IIS7 is not like in previous version, you need to give permissions to the account under which the application pool is running:

See this:

IIS7 Permissions Overview - ApplicationPoolIdentity

And this:

IIS AppPoolIdentity and file system write access permissions