Internet Security Systems RealSecure User Manual page 46

Chapter 4: Configuring RealSecure Desktop Protector
Blocking a Port
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If you don't have a specific intruder in mind but you are concerned about intrusion
attempts using a particular internet protocol, you can block the port that protocol uses.
Adding a port entry to your firewall ensures that no traffic from any IP address can enter
your system using that port.
To block a port:
1. From the Tools menu, select Advanced Firewall Settings.
2. Click Add.
The Add Firewall Entry window appears.
3. Type a name for the port in the Name field.
You can use any name. For convenience, try using the name of the protocol or
Note:
the software that uses the port, such as "Quake" or "SMTP."
4. Type the port number in the Port field.
Use a whole number between 1 and 65535.
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To enter a range of ports, use the format 9-999.
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To close all ports on your computer to communications from a specific IP address,
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select All Ports, then go to "Blocking an IP address" on page 37.
You cannot use Add Firewall Entry to block or accept all transmissions from all
Note:
IP addresses through all ports. To instruct Desktop Protector to block all unsolicited
inbound traffic, select the "Paranoid" protection level on the Firewall tab. To accept all
traffic, select the "Trusting" protection level. For more information, see "Setting Your
Protection Level" on page 34.
5. Select the port type in the Type field.
To create an entry for both port types, you must create two separate port filters.
Note:
6. In the Mode area, select Reject.
The Desktop Protector application closes the port.
7. In the Length of Block area, select the length of time to block the port.
8. Click Add.
Desktop Protector adds the entry to the list in the Advanced Firewall Settings
window.