This paper presents a client-server software that violates security rules defined by firewalls and proxies. A firewall is a set of components, interposed between two networks, that filters the traffic according to rules based on a security policy. Several techniques may be used to make firewalls obsolete, for instance: tunneling and cryptography. The software presented in this paper is composed by two modules: a client and a server one. the client module must be installed in any host of the local network that is not protected by a firewall or a proxy. The server module must be installed in the Internet, in a host accessible by the client module. With this software, it’s possible to bypass firewalls and proxies.