A cloud computing is a new computing paradigm, which offers service to a number of user. Cloud computing is easy to use and cost economical. User can request cloud service via web browser. Though its offer service to user, but at the same time it possesses many security risks. In this paper, the authors detect the possible security attack on cloud such as Denial Of Services (DOS), fingerprinting and unauthorized user. The proposed techniques prevent the cloud servers and users from attacker, which are implemented using window azure framework.