Emsa Port Blocker is a TCP blocking utility. It blocks unwanted tcp access from/to your computer. It is not a firewall, but up to some extent it could be regarded as a similar tool. Its purpose is to prohibit TCP access on certain ports and IP addresses. It can also be used as a TCP monitor because it shows TCP connections currently active on the machine. It can be configured to block access to certain local ports, but it can also prohibit access to specified remote ports as well.