With increasing number of ICT users and providers of critical services increases also the number of security incidents. The most threatened areas are finance, energy industries, electronic services and public services. These incidents negatively influence the trust of the users and decelerate the development of information society.  Cyber security is therefore one of the priorities of network and electronic services providers. Governments all around the world endeavor to increase effectivity of defense against attacks on information systems. We can see the change how cyber security is understood in establishment of new organizations and provision of new services that actively protect the cyber space and build security community. In the Slovak Republic special unit of the Ministry of Finance of the Slovak Republic CSIRT.SK (Computer Security Incident Response Team Slovakia) and NIX.CZ association have started a cooperation that has introduced to Slovakia project FENIX. The project was developed in the Czech Republic in 2013 as a reaction to intense DoS attacks aimed at significant Czech media, banks and operators. The objective of the project is to enable internet services of engaged subjects during DoS attack.