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SonicWall virtual firewall error "This serial number is already used with another installation"
03/26/2020 
29 People found this article helpful
488,782 Views
Description
After virtual firewall is reinstalled, it needs to be registered. Sometimes registration gets error:
This serial number is already used with another installation (E1004)
Resolution
The previous installation of virtual firewall was not properly removed.Customer's can de-register it in two ways:
De-Register from Firewall GUI
- Navigate to Manage|Updates|Licenses.
- Click DEREGISTER.
Delete and Register the product in MYSonicWall account (Similar to De-register)
- To Delete the product, please follow How to Delete a Device from mysonicwall.
- To Register the product, please follow How can I Register a Product in mysonicwall.
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YES
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