System Timeout; Introduction To Https - ZyXEL Communications Internet Security Appliance ZyWALL5UTM 4.0 User Manual

ZyWALL 5/35/70 Series User's Guide
1 A filter in SMT menu 3.1 (LAN) or in menu 11.5 (WAN) is applied to block a Telnet,
FTP or Web service.
2 You have disabled that service in one of the remote management screens.
3 The IP address in the Secure Client IP Address field does not match the client IP
address. If it does not match, the ZyWALL will disconnect the session immediately.
4 There is already another remote management session with an equal or higher priority
running. You may only have one remote management session running at one time.
5 There is a firewall rule that blocks it.

27.1.2 System Timeout

There is a default system management idle timeout of five minutes (three hundred seconds).
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. You can change the timeout period in the System screen.

27.2 Introduction to HTTPS

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).
It relies upon certificates, public keys, and private keys (see
information).
HTTPS on the ZyWALL is used so that you may securely access the ZyWALL using the web
configurator. The SSL protocol specifies that the SSL server (the ZyWALL) must always
authenticate itself to the SSL client (the computer which requests the HTTPS connection with
the ZyWALL), whereas the SSL client only should authenticate itself when the SSL server
requires it to do so (select Authenticate Client Certificates in the REMOTE MGMT,
WWW screen). Authenticate Client Certificates is optional and if selected means the SSL-
client must send the ZyWALL a certificate. You must apply for a certificate for the browser
from a CA that is a trusted CA on the ZyWALL.
Please refer to the following figure.
1 HTTPS connection requests from an SSL-aware web browser go to port 443 (by default)
on the ZyWALL's WS (web server).
2 HTTP connection requests from a web browser go to port 80 (by default) on the
ZyWALL's WS (web server).
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Chapter 20 on page 338
Chapter 27 Remote Management
for more