Update: The original question was for Windows Server 2008, but the solution is easier for Windows Server 2008 R2 and Windows Server 2012 (and Windows 7 and 8). You can add the user through the NTFS UI by typing it in directly. The name is in the format of IIS APPPOOL\{app pool name}. For example: IIS APPPOOL\DefaultAppPool.
IIS APPPOOL\{app pool name}
Note: Per comments below, there are two things to be aware of:
- Enter the string directly into the "Select User or Group" and not in the search field.
- In a domain environment you need to set the Location to your local computer first.
Reference to Microsoft Docs article: Application Pool Identities > Securing Resources
Original response: (for Windows Server 2008) This is a great feature, but as you mentioned it's not fully implemented yet. You can add the app pool identity from the command prompt with something like icacls, then you can manage it from the GUI. For example, run something like this from the command prompt:
icacls c:\inetpub\wwwroot /grant "IIS APPPOOL\DefaultAppPool":(OI)(CI)(RX)
Then, in Windows Explorer, go to the wwwroot folder and edit the security permissions. You will see what looks like a group (the group icon) called DefaultAppPool. You can now edit the permissions.
However, you don't need to use this at all. It's a bonus that you can use if you want. You can use the old way of creating a custom user per app pool and assigning the custom user to disk. That has full UI support.
This SID injection method is nice because it allows you to use a single user but fully isolate each site from each other without having to create unique users for each app pool. Pretty impressive, and it will be even better with UI support.
Note: If you are unable to find the application pool user, check to see if the Windows service called Application Host Helper Service is running. It's the service that maps application pool users to Windows accounts.
Best Answer
Every Application Pool is (normally) associated with one worker process named w3wp.exe
If the application pool becomes unresponsive, you can kill it. It doesn't affect any of the other application pools or IIS over all.
All sites using that application pool will be affected, but they may be already.
The application pool may start up again automatically, but you should check that.
If you have multiple application pools, you will see multiple
w3wp.exeso you need to kill the correct one.On Server 2012+, open task manager and click on the
Detailstab. right click on the column headersSelect columnsand tickCommand line.Now look at the w3wp.exe processes and find the one that has your application pool name in its command line. Right click that process and
End TaskI don't think in older versions of Windows you can see the command line.
You can use third party tools like Process Explorer or Process Hacker, the second one can try many ways to kill a process.