What is Peerblock?

PeerBlock (formerly PeerGuardian) lets you control who your computer "talks to" on the Internet. By selecting appropriate lists of "known bad" computers, you can block communication with advertising or spyware oriented servers, computers monitoring your p2p activities, computers which have been "hacked", even entire countries! They can't get in to your computer, and your computer won't try to send them anything either.

Official website: http://www.peerblock.com

Download: PeerBlock-Setup_v1.1_r518.exe

You need Blocklists (also known as "Blacklists") for setting up PeerBlock to handle certain IP-ranges.

Get the IP-Blocklists @ IBlockList.com

Note that your IP-Blocklists shouldn't be too large. This slows down your internet and is the main reason when websites seem to be down, but actually the website's server IP is in the blocklists.

Peerblock and HMA! Pro VPN

You can decide to use HMA! Pro VPN together with Peerblock. This potentially increases security because it prevents connections to anti-P2P-companies, spammers, hackers etc. from being made. So it's actually a quite good idea to mix both services, but it can result in connectivity-problems.
Watch what you add into the blocklists or else you can't connect to

• Seeds & Peers
• certain websites
• your local network
• your router

It's easy to find out if Peerblock is the reason for your connectivity problems - just deactivate it and check again.
For prevent this problems from happening, you should only add anti-P2P-IPs into your blocklist-database and only things that are really dangerous for you.
In addition, most IPs in those blocklists are outdated long before you're using them. (-> dynamic IPs)