Date: 06/14/06 (Java Web)    Keywords: java

You can forcibly bind to the same address and port to which there is an open server socket by using SO_REUSEADDR option (ServerSocket.setReuseAddress(boolean on) in Java). Such reuse can be exploited by malicious applications to disrupt the functioning of the original server application and worse. The SO_EXCLUSIVEADDRUSE option prevents other sockets from being forcibly bound [...]

Source: http://blog.taragana.com/index.php/archive/server-security-how-to-prevent-socket-hijacking-on-windows/