In my analytics I can see a referral visit from 127.0.0.1:49152 , when I click it for more details it says it is coming from /unlock/http://www.mysite.com/popular-page-on-my-site/
Never seen this before, can't find any info on it.
I recently had someone hack into my server and use my server and it's resources to start hacking into other servers. It got progressively worse, to the point where I had to wipe that server of all it's content. If I were you, I would contact your hosting company right away and ask them if they think it's an attack.
I was running an older version of plesk that hadn't the new security features, meaning that when the server got hacked it was "root compromised". I don't know the details of exactly how they managed to crack it though. I am now running the most up to date cPanel on both of my dedicated servers.