Firewall Concepts
is a controlled gateway between two networks. A firewall limits external client connections
to a set of restricted ports on one or more computers
that are inside the firewall.
Web servers and other
network applications can also use firewalls to limit access to servers.
SAS/CONNECT permits
TCP/IP connections between clients outside a firewall to a
spawner that runs on a
SAS/CONNECT server inside a firewall.
enables the server session to inherit the
socket that the spawner uses to communicate with the
client session. The socket is then used for subsequent communications between the client and the
server session. Socket inheritance is significant because a single
port can be used for starting an unlimited number of server sessions.
Before this innovation, a separate port was opened for each client that connected
to a server by using a spawner. Socket inheritance limits the number of ports that
are used for connections through
a firewall, which improves the security of a firewall configuration and simplifies
administration
of a firewall configuration.
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