ZyXEL Communications USG 2000 User Manual

Chapter 50 System

ZyWALL USG 2000 User’s Guide

• See 

 for more on To-ZyWALL firewall rules.

• See 

 for an example of configuring service control to 

block administrator HTTPS access from all zones except the LAN. 

To stop a service from accessing the ZyWALL, clear Enable in the corresponding 
service screen. 

A service cannot be used to access the ZyWALL when:

You have disabled that service in the corresponding screen.

The allowed IP address (address object) in the Service Control table does not 
match the client IP address (the ZyWALL disallows the session).

The IP address (address object) in the Service Control table is not in the allowed 
zone or the action is set to Deny. 

There is a firewall rule that blocks it.

There is a lease timeout for administrators. The ZyWALL automatically logs you 
out if the management session remains idle for longer than this timeout period. 
The management session does not time out when a statistics screen is polling. 

Each user is also forced to log in the ZyWALL for authentication again when the 
reauthentication time expires. 

You can change the timeout settings in the User/Group screens.

You can set the ZyWALL to use HTTP or HTTPS (HTTPS adds security) for Web 
Configurator sessions. Specify which zones allow Web Configurator access and 
from which IP address the access can come.

HTTPS (HyperText Transfer Protocol over Secure Socket Layer, or HTTP over SSL) 
is a web protocol that encrypts and decrypts web pages. Secure Socket Layer 
(SSL) is an application-level protocol that enables secure transactions of data by 
ensuring confidentiality (an unauthorized party cannot read the transferred data), 
authentication (one party can identify the other party) and data integrity (you 
know if data has been changed).