Specifications
Table Of Contents
- About This Document
- Understanding Networking and IP Addressing
- Introduction to Networking
- Networking using IP
- Niagara Considerations
- Additional Information
- Configuration and Troubleshooting Tools
- Connecting on a LAN
- Connecting with Direct Dial
- Connecting to an ISP
- Using Security Technologies
- Configuration Files Used for Communication
- Glossary
- Index
Niagara Release 2.3
Revised: May 22, 2002 Niagara Networking & Connectivity Guide
Chapter 6 Using Security Technologies
Default Niagara Port Numbers
6–22
Disabling Open
Ports on
Microsoft
Windows NT 4.0
Use the following procedure to enable only those ports (Niagara and other) that you
require:
Procedure 6-8 Disabling open ports.
Step 1
Access the desktop of the JACE-NP with either a keyboard, monitor and mouse
(Full) or NetMeeting (Embedded). For instructions, see “NetMeeting,” page 2-2.
Step 2
On the desktop, right-click the Network Neighborhood icon and select Properties.
Step 3
Click the Protocols tab, then double-click TCP/IP Protocol.
The TCP/IP Properties dialog box opens.
Step 4
On the IP Address tab, click Advanced.
Step 5
Click the Enable Security check box, and then click Configure.
Step 6
In the TCP Ports area, click Permit Only and click Add.
Step 7
Type the number of a port that you want to enable on this host, and click Add.
Step 8
Repeat steps 8–9 until you have added all the TCP ports you wish to enable.
Caution If you leave the TCP list blank, all port connections of that type are disabled
(and you may not be able to access the host). Be sure to add all the ports that
are required before proceeding.
Step 9
In the UDP Ports area, click Permit Only and click Add.
Step 10
Type the number of a port that you want to enable on this host, and click Add.
Note Disabling UDP port 137 impacts Microsoft NetBIOS naming. If you disable this port
you will not be able to resolve the host name if you try to contact it on a Windows
network. You can, however, still contact the host using its IP address.
Step 11
Repeat steps 8–9 until you have added all the UDP ports you wish to enable.
Note If you leave the UDP list blank, all port connections of that type are disabled. Be sure
to add all the ports that are required before proceeding.
Step 12
When finished adding ports, click OK until you are returned to the desktop.
Step 13
When prompted, restart the host.
Step 14
Test the functionality of the Niagara software and other applications (RCMD,
NetMeeting) to verify that you can still access them on the host.