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Troubleshooting Guide Page 255
• If you are using an Internet Explorer browser, you can want to click the Refresh button several
times to fully load the Java and Java script programs. Also, wait until Java applet has completely
loaded before attempting to log in.
The SonicWALL does not save changes that you have made
• When configuring the SonicWALL, be sure to click Update before moving to another window or
tab, or all changes will be lost.
•Click Refresh or Reload in the Web browser. The changes can have occurred, but the Web
browser can be caching the old configuration.
Duplicate IP address errors
Duplicate IP address errors occur when the SonicWALL is installed
• Try restarting the router, or restarting LAN computers.
• Make sure the LAN is not connected to the WAN port of the SonicWALL.
Machines on the WAN are not reachable
• Make sure the Intranet settings in the Advanced section are correct.
If these suggestions don’t help, please take a look at the current FAQ (Frequently Asked Questions)
and Troubleshooting Guide on the SonicWALL Web site:
<http://www.sonicwall.com/support>.
VPN tunnel problems
• Document your VPN layout. Did you draw out the design before setting it up?
• VPNs are a routed network. Trace a packet’s path through the devices on your network and see
if there is any reason for it to be blocked.
• Re-check your entries for typographical errors.
• Check the basic network configuration on the LAN PCs. Make sure the correct default router in-
formation is entered.
• Enable Network Debug and VPN Tunnel Status on the Log Settings page.
• Ping the other protected network from using Ping on the Tools page. If ping works, then the prob-
lem is on the LAN.
• Reset the VPN to basic configuration using Manual key and DES HMAC MD5. If that works, then
upgrade to IKE and pre-shared secret.