If the Web servers do not seem to be accessible, go to the Firewall > Access Rules page and mouse over the Statistics icon.
If the rule is configured incorrectly you will not see any Rx or TX Bytes; if it is working, you will see these increment with each successful external access of the load balanced resources.
You can also check the Firewall > NAT Policies page and mouse over the Statistics icon. If the policy is configured incorrectly you will not see any Rx or TX Bytes; if it is working, you will see these increment with each successful external access of the load balanced resources.
Finally, check the logs and the status page to see if there are any alerts (noted in yellow) about the Network Monitor noting hosts that are offline; it may be that all of your load balancing resources are not reachable by the SonicWall appliance and that the probing mechanism has marked them offline and out of service. Check the load balancing resources to ensure that they are functional and check the networking connections between them and the SonicWall appliance.