ZyXEL Communications P-660HW-D User Manual page 254

Chapter 21 Troubleshooting
1 Check the hardware connections, and make sure the LEDs are behaving as expected. See
the Quick Start Guide and
2 If your ISP gave you Internet connection information, make sure you entered it correctly
in the Network > WAN > Internet Connection screen. These fields are case-sensitive,
so make sure [Caps Lock] is not on.
3 If you are trying to access the Internet wirelessly, make sure the wireless settings in the
wireless client are the same as the settings in the AP.
4 Disconnect all the cables from your device, and follow the directions in the Quick Start
Guide again.
5 If the problem continues, contact your ISP.
I cannot make Voice over Internet (VoIP) calls through the ZyXEL Device.
1 Check your connections. Ensure that the LEDs are behaving as expected (see
on page
2 Ensure that your VoIP account is correctly configured.
3 If you are using Network Address Translation (NAT), make sure that Enable SIP ALG
is activated in the NAT > General screen. See
4 Ensure STUN is turned off on your VoIP device.
5 If you are using a new VoIP account, contact your Internet Telephony Service Provider
(ITSP) to ensure that it is activated.
I cannot access the Internet anymore. I had access to the Internet (with the
ZyXEL Device), but my Internet connection is not available anymore.
1 Check the hardware connections, and make sure the LEDs are behaving as expected. See
the Quick Start Guide and
2 Reboot the ZyXEL Device.
3 Turn the ZyXEL Device off and on.
4 If the problem continues, contact your ISP.
The Internet connection is slow or intermittent.
1 There might be a lot of traffic on the network. Look at the LEDs, and check
on page
some programs that use the Internet, especially peer-to-peer applications.
2 Reboot the ZyXEL Device.
3 Turn the ZyXEL Device off and on.
4 If the problem continues, contact the network administrator or vendor, or try one of the
advanced suggestions.
254
Section 1.4 on page
33).
Section 1.4 on page
33. If the ZyXEL Device is sending or receiving a lot of information, try closing
33.
Section 8.2 on page 128.
33.
P-660HW-D User's Guide
Section 1.4
Section 1.4