You manage security for a Communications Services deployment by taking a “defense in depth” approach. By individually securing the network, hardware platform, operating system, and applications themselves, you make each layer of the architecture secure. Security includes hardening each layer by closing unnecessary network ports and access mechanisms. You also minimize the number of installed software packages so that only those packages required by the system are available. Finally, you secure and insulate the layers from unintended access within the network.
You can implement a Messaging Server proxy server to augment data security. A proxy server placed on the firewall with the Messaging Server behind it prevents attacks on the information on the Messaging Server.
Calendar Server provides a number of security levels to protect users against eavesdropping, unsanctioned usage, or external attack. The basic level of security is through authentication. Calendar Server uses LDAP authentication by default, but also supports the use of an authentication plugin for cases where an alternate means of authentication is desired. Integration with Access Manager enables Calendar Server to take advantage of its single sign-on capability.
Instant Messaging ensures the integrity of communications through its multiple authentication mechanisms and secure SSL connections. Integration with Portal Server and Access Manager bring additional security features, services-based provisioning access policy, user management, and secure remote access.
To ensure a completely secure environment, the deployment needs a time server to synchronize the internal clocks of the hosts being secured.