ZyXEL Communications ZYWALL10 User Manual

ZyWALL 10 Internet Security Gateway

12-2

Telnet

There is a system timeout of 5 minutes (300 seconds) for either the console port or telnet. Your ZyWALL
will automatically log you out if you do nothing in this timeout period, except when it is continuously
updating the status in menu 24.1 or when 

sys stdio

 has been changed on the command line.

Telnet over the WAN will not work if the firewall is active because the default firewall policies block all
traffic from the WAN to the LAN. To enable Telnet over the WAN, you must turn the firewall off (menu
21.2) or create a firewall rule to allow Telnet from the WAN. Telnet will also not work when
1.  You have disabled Telnet service in menu 24.11.
2.  You have applied a filter in menu 3.1 (LAN) or in menu 11.5 (WAN) to block Telnet service.
3.  The IP you entered in the Secured Client IP field in menu 24.11 does not match the client IP. If it does

not match, the ZyWALL will disconnect the Telnet session immediately.

4.  You have an SMT console session running.
5.  The firewall is active. The default firewall policies block all traffic from the WAN, so to enable FTP

over the WAN, you must turn the firewall off (menu 21.2) or create a firewall rule to allow FTP from
the WAN.