When SSLSECURE= is set to YES or PREFERRED, TLS is used to secure client/server data
communication for both local and remote clients
that are configured to use TLS by default.
A UNIX domain socket is an inter-process communication mechanism that provides for
exchanging data
between processes executing on the same host operating system. All communication for
UNIX domain sockets occurs within the operating system kernel, which ensures secure,
efficient communication. TLS uses inter-process TCP/IP socket communication for processes
on the same host. UNIX
domain sockets can offer better performance than inter-process TCP/IP socket communication
on the same host.
When TLS is not configured for
SPD Server, local data communication between SPD Server and its clients for UNIX use UNIX domain
sockets.