This article explains the how you can identify the issue and the suggested workaround for the issue
Identifying the issue by Downloading the Tech Support Report (TSR) from the NSv:

Suggested Workaround:


 EXAMPLE: 192.168.168.168/sonicui/7/m/Mgmt/settings/diag.


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NOTE:Â Virtual Firewalls will require a reboot and will require the Serial Number, Authentication Code and Registration Code to be entered which can be gathered from mysonicwall.com You may also be prompted to choose between Classic and Policy for Policy Mode Switching
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You can reach out to the support team with the Issue ID MSW-42763 for any further assistance on the issue