I could not find anything recent posted here as to what happened to Pornbits.net. Following an old dead thread from 2012 I found the link: http://pornbits.net/resetpassword.

Here is what it says for anyone interested:

Pornbits.net news
Hello,

If you're reading this, you are probably wondering what happened to your beloved porn. Unfortunately, the pornbits.net server recently became a victim of multiple hardware failures. To make matters worse, our offsite backups have been rendered useless. As such, we are faced with a complete data loss.

What does this mean for you?
It means we will be offline for quite some time, or may never return. If we do get things back up and running, all of your account details, all torrents, everything will be gone. We would be starting fresh.