ZyXEL Communications AMG1202-T10B Support Notes page 23

(1) 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 WWW/Telnet connection
from WAN. The WAN-to-LAN ACL summary will look like as shown below.
WWW (For accessing Web Configurator):
Source IP= Remote trusted host
Destination IP= router' WAN IP
Service= TCP/80
Action=Forward
TELNET (For accessing Command Line Interface):
Source IP= Telnet Client host
Destination IP= router' WAN IP
Service= TCP/23
Action=Forward
(2)You have disabled WWW/Telnet service in Web Configurator, Advanced
setup, Maintenance -> RemoteMGNT:
(3) WWW/Telnet service is enabled but your host IP is not the secured host
entered in Web Configurator, Advanced setup, Maintenance ->
RemoteMGNT:
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AMG1202-T10B/AMG1302-T10B
Support Notes
23