This topic describes the keywords and parameters that are used in the DCAS configuration file. It also describes tips for each DCAS parameter for AT-TLS configuration when TLSMECHANMISM is set to AT-TLS. For more information about AT-TLS policies, see Required AT-TLS policies when DCAS TLSMECHANISM is set to ATTLS and Migrating existing DCAS server to use AT-TLS policies in z/OS Communications Server: IP Configuration Guide.