What should I do about this user? The user is:

* Downloading pornography
* Attempting unauthorized access
* Running hacking software
* Sending unsolicited email
* Installing software / tampering with the system
* etc

**This is intended as a generic answer for employee behavioral problems, a la [Can you help me with my software licensing question?](https://serverfault.com/questions/215405/can-you-help-me-with-my-software-licensing-question)**

I could see where acceptable use issues are a touch out of scope for SF, however it is one of those things most sysadmins will run into. I don't want to keep rewriting similar answers.