I was trying to reproduce an issue posted on the forums @ (http://forums.iis.net). As with many posts, I mention use Process Monitor. Here is a perfect example.
Find out what PID (process ID) in task manager
Open Process Monitor and isolate the PID (This helps cutdown on noise)
Reproduce the issue. (In my case, notice the highlighted line, it’s looking for c:domainsftprootssuser1). I have the FTP 7.0 service running on a domain controller. It means I need to create the SS (NetBIOS name) as a virtual directory for user isolation. I don’t recommend running FTP on a domain controller, so this is for demo purposes. PS: Once I added the SS virtual directory, I was able to use FTP user isolation.
Here is an article how to setup FTP 7.0
I thank Mark for creating Process Monitor!
Microsoft MVP – IIS