Clean Up a Firewall Rule Without Breaking the Business
Apply a safe evidence-based process to narrow or remove stale firewall rules.
A nine-month-old temporary migration rule allows broad TCP access between app and database subnets. Firewall policy lifecycle: define purpose, test need, narrow scope, monitor, and retire stale access. Deleting broad rules without flow evidence can cause outages; leaving them forever preserves unnecessary attack paths. Find purpose and owner Read the ticket, object names, comments, and CMDB links; ask the ERP owner whether the migration is complete. Ownership turns a risky technical object into an accountable decision. Inspect observed flows Review hit counts and logs for 30 days: app01/app02 to db02 TCP/1521 are the only active flows. Observed flows show what…
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