17 troubleshooting guide, The link led is off, A computer on the lan cannot access the internet – SonicWALL Internet Security Appliances User Manual
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Page 254 SonicWALL Internet Security Appliance Administrator’s Guide
17 Troubleshooting Guide
This chapter provides solutions for problems that you might encounter when using the SonicWALL.
If you are unable to solve your problem, please visit the SonicWALL Tech Support Web site at
<http://www.sonicwall.com/support>. There, you will find resources to help you resolve most
technical issues, as well as a means to contact one of the SonicWALL Technical Support
engineers.
The Link LED is off
•
Make sure the SonicWALL is powered on.
•
Make sure the cable connections are secure. Gently moving the cable back and forth should not
make the Link LED turn on and off.
•
Try replacing the cable with a known good cable.
•
Is it the correct cable? Try using a standard Ethernet or crossover cable instead.
A computer on the LAN cannot access the Internet
•
If NAT is enabled, make sure the default router address of the LAN computer is set to the
SonicWALL LAN IP Address.
•
All computers on the LAN should be able to log into the SonicWALL Management Interface by
typing the SonicWALL LAN IP Address into the Location or Go to field from a Web browser. If the
SonicWALL authentication screen does not appear, check for Ethernet connectivity problems.
Confirm that the computer without Internet access is assigned an IP address in the correct
subnet.
•
Make sure that the SonicWALL is powered on and responsive.
•
If a computer can access the SonicWALL Management Interface, but cannot view Web sites,
then check DNS configuration of the computer.
•
Try restarting your Internet router and the computer.
•
The Internet connection can be down. Disconnect the SonicWALL and try to access the
Internet.
•
If there are any host devices other than the Internet router connected to the WAN port, they are
inaccessible to users on the LAN unless you have configured the SonicWALL
Intranet settings.
The SonicWALL does not establish authenticated sessions
•
During initial configuration make sure to change the Management Station's IP address to one
in the same subnet as the SonicWALL's, such as "192.168.168.200".
•
Check to make sure the Web browser has Java, JavaScript, or ActiveX enabled.
•
Make sure the users are attempting to log into the correct IP address. The correct address is
the SonicWALL LAN IP Address, and not the NAT Public Address if NAT is enabled.
•
Make sure that users are attempting to log in with a valid user name and password.
•
Remember that passwords are case-sensitive; make sure the "Caps Lock" key is off.