ZyXEL ZyWALL USG 2000 User Guide - Page 798

Chapter 50 System • See To-ZyWALL Rules on page 424 for more on To-ZyWALL firewall rules. • See Section 7.9 on page 147 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. 50.6.1 Service Access Limitations A service cannot be used to access the ZyWALL when: 1 You have disabled that service in the corresponding screen. 2 The allowed IP address (address object) in the Service Control table does not match the client IP address (the ZyWALL disallows the session). 3 The IP address (address object) in the Service Control table is not in the allowed zone or the action is set to Deny. 4 There is a firewall rule that blocks it. 50.6.2 System Timeout 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. 50.6.3 HTTPS 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). 798 ZyWALL USG 2000 User's Guide