Detect the HTTP RPC endpoint mapper

This detects the http-rpc-epmap service by connecting to the port 593 and processing the buffer received. This endpoint mapper provides CIS (COM+ Internet Services) parameters like port 135 (epmap) for RPC.
Deny incoming traffic from the Internet to TCP port 593 as it may become a security threat in the future, if a vulnerability is discovered. For more information about CIS: