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The security of the intranet has been given more emphasized in recent years. This paper analyzes the defects of the intranet admission control protocol and the intrusion tolerant technology, which is used for certification authentication (ca) and the authentication server (AS). An intranet security authentication management framework based on intrusion tolerance (IT-IAMF) is proposed, and the principle of the major modules in the framework is analyzed. Finally, the prevention strategies and the security attributes of attack in this framework are illustrated.