ZyXEL Communications 2 Plus User Manual

Chapter 45 Troubleshooting

ZyWALL 2 Plus User’s Guide

interfering with the wireless network (for example, microwaves, other wireless 
networks, and so on).

3 Reboot the ZyWALL. 
4 If the problem continues, contact the network administrator or vendor, or try one of the 

advanced suggestions.

• Check the settings for bandwidth management. If it is disabled, you might consider 

activating it. If it is enabled, you might consider changing the allocations. 

V

I cannot access the ZyWALL or ping any computer from the WLAN.

1 Make sure the wireless LAN is enabled on the ZyWALL
2 Make sure the wireless adapter on the wireless station is working properly.
3 Make sure the wireless adapter (installed on your computer) is IEEE 802.11 compatible 

and supports the same wireless standard as the ZyWALL.

4 Make sure your computer (with a wireless adapter installed) is within the transmission 

range of the ZyWALL.

5 Check that both the ZyWALL and your wireless station are using the same wireless and 

wireless security settings.

6 Make sure traffic between the WLAN and the LAN is not blocked by the firewall on the 

ZyWALL.

7 Make sure you allow the ZyWALL to be remotely accessed through the WLAN 

interface. Check your remote management settings.

V

When using UPnP and the ZyWALL reboots, my computer cannot detect 
UPnP and refresh My Network Places > Local Network.

1 Disconnect the Ethernet cable from the ZyWALL’s LAN port or from your computer.
2 Re-connect the Ethernet cable. 

V

The Local Area Connection icon for UPnP disappears in the screen.