Specifications

Chapter 6 Using Security Technologies
Default Niagara Port Numbers
Niagara Release 2.3
Niagara Networking & Connectivity Guide Revised: May 22, 2002
6–7
Default Niagara Port Numbers
Note If you are unfamiliar with the role application ports play in Internet communications,
please review the “About Ports” section on page 1-31.
As with most Internet-enabled applications, the applications running on Niagara
hosts also use default ports for communication with clients (typically other Niagara
hosts, or BUI users). For instance:
• a browser client that connects to a GxPage does so on port 80 of a Niagara host
running WebUI services.
• an engineering PC (the client) uses JDE to connect to a station for maintenance,
also on the station’s server port 80.
• an engineering PC (the client) uses the Admin Tool to change an IP address on
the host, and connects on the host’s server port 3011.
Table 6-1 table provides a list of the types of communication used by Niagara hosts,
and the default server ports used. Unless otherwise noted:
• the client randomly chooses an available client-side port (1024 or greater) to
talk to the listed server port
• the server port listed is a TCP port (rather than a UDP port)
• most of the ports in the table are constantly open. Some applications (such as
FTP, or our web server) constantly keep a port open, which means the port is
scannable by a port scanner. Other ports (such as the host Admin port) only are
shown when they are in use.
For a description of the communication functions listed in Table 6-1, see the
“Communication between Niagara Hosts” section on page 1-35.
Table 6-1 Communication between Niagara hosts and the default server port used.
Communication Client Server Default Server Port
Browser User
Interface (BUI)
Any host Any Niagara host • 80—to access Gx, chart, calendar
and schedule pages and station
administration servlet pages (for a
description of these, see “Changing
the Station HTTP Port (80),” page
6-9).
• 3011
1
—to access host-based
administration pages (for a
description of these, see “Changing
the Administration Port (3011),”
page 6-12).
Java Desktop
Environment (JDE)
Engineering PC Any Niagara host 80