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The exponential growth in wireless network faults, vulnerabilities, and attacks make the Wireless Local Area Network (WLAN) security management a challenging research area. Deficiencies of security methods like cryptography (e.g. WEP) and firewalls, causes the use of more complex security systems, such as Intrusion Detection Systems, to be crucial. In this paper, we present a hybrid wireless intrusion detection system (WIDS). To implement the WIDS, we designed a simple lightweight agent. The proposed agent detect the most destroying and serious attacks; Man-In-The-Middle and Denial-of-Service; with the minimum selected feature set. To evaluate our proposed WIDS and its agent, we collect a complete data-set using open source attack generator softwares. Experimental results show that in comparison with similar systems, in addition of more simplicity, our WIDS provides high performance and precision.