Hello,
Thank you for posting in Microsoft Q&A.
Based on the description, I understand your question is related to Getting alert, A change was made to the Windows Firewall exception list. A rule was deleted.
You can use the Windows Event Viewer to look for events with IDs 2006 or 2033, which indicate firewall rule deletions. Also, event ID 4948 indicates a change in the Windows Firewall exception list, specifically a rule deletion.
Check if there is any Group Policy settings that might be causing the rule deletion.
Here is a reference link:
Have a nice day.
Best Regards,
Molly
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