There are some fundamental differences between
publishing rules and access rules, however, such as the following:
. Individual publishing rules can publish only a single server, whereas access rules can
allow blanket access to an entire range of systems.
. Port translation can be accomplished through server publishing rules, but not
access rules.
. Certain application filters in ISA Server were designed to work with server publishing
rules only, such as the SMTP filter.
. Web publishing rules can be used in single-NIC (unihomed) scenarios because the
web traffic terminates at the ISA server and is then retransmitted to the actual web
server. This is not possible with access rules (or any other non??“web-based publishing
rules, for that matter).
. Access rules cannot be used to grant access to NAT clients; only server rules can be
used for this.
Publishing an RPC Service
It is a relatively straightforward process to publish an RPC service in ISA Server 2006. The
following step-by-step procedure illustrates how to publish general RPC traffic to a particular
server. In this scenario, users on the Internal network need to have full RPC access to a
server on the DMZ network, so an RPC server publishing rule is created.
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