Why can I make Telnet to ZyWALL from WAN?
There are three reasons that Telnet from WAN is blocked. When the firewall is turned on, all connections from WAN to LAN are blocked by the default ACL rule. To enable Telnet from WAN, you must turn the firewall off or create a firewall rule to allow Telnet connection from WAN. The WAN-to-LAN ACL summary will look like as shown below. Source IP= Telnet host Destination IP= ZyWALL’s WAN IP Service= TCP/23 Action=Forward You have disabled Telnet service Telnet service is enabled but your host IP is not the trusted secure host entered. In this case, the error message ‘Client IP is not allowed!’ is appeared on the Telnet screen.
