The Active Directory System Manager ADSM ,Active Directory Domains enable convenient secure communication among disparate corporate entities as they manage users' access, enforce security restrictions and prevent inappropriate access to internal networks and resources. This work presents the simulation of Domain based software called Active Directory System Manager (ADSM). The main purpose of ADSM is to add services to an existing Active Directory Domain environment and provide the users with a secure connection through a computer network. ADSM contains three sub-systems: Administration, Shared Manager and Chat. The communication in those parts is based on Dynamic Packet Filtering technique that is the system analyzes each network access request; requests are then compared to a set of parameters that are already set by network Administrator to identify, authenticate and authorize each user on the network.