Before attempting the fix, can you please ensure you have access to your mysonicwall.com account as you may need to reset the license, once you have confirmed this, please perform the following:
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1. Go to Manage | System Setup | Server| Host Configuration on the Email Security and ensure that a public DNS (eg, 8.8.8.8) is set if possible as the backup DNS. Once this is done, verify you can connect to it by going to Investigate| Tools| Diagnostics , now change the dropdown to "Connect to the specified hostname or IP" and input in your selected secondary DNS servers external IP using port 53 and check to ensure there is connectivity.
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2. Now that you have been able to verify that you have Name Resolution and its not a firewall issue, please take note of your mysonicwall.com account details, as you will now need to reset the license on the appliance and re-register it.
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3. Go to Manage | System Setup | Server| Advanced scroll down the page to see the "Reset Licenses" button. Now, go to Manage| License Management and sign into mysonicwall.com. Compare the License count on mysonicwall.com against the interface of your appliance via Manage | License Management, as it should now match.
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NOTE: If you get an error that another serial Number is already registered with this device, please contact customer service, as the old serial association has to be removed from the appliance.