What do you mean "it tries, but fails?" What happens? Is there an error message or dialog box?
What does the script contain? Is it this:
@echo off
start http://myurl.com
Does everyone logoff at the same time? Or within a few minutes of each other?
If they do, you can write a script and schedule it with AT to run a few minutes before people logoff.
I don't know for sure, but I don't think that logoff scripts can be interactive. Meaning, that when it launches, the user logs off the network and script does it's job, with no user interactione. Logoff scripts are usually used for deleting temp files and the like.
I don't know how to do it, but you might be able to log when a user logs off, and record it in a database and then feed the corresponding user's logoff time to your spreadsheet or database.
Anyone else have any ideas on this? (maybe Hero knows)
"Computer security." — Oxymoron