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The earliest recollection of this bug is traced back to PAN-OS 12.1.5 - February 19, 2026. This bug is fixed in PAN-OS versions 12.1.5. Fixed an issue where traffic was unexpectedly blocked due to a misconfiguration with an empty or invalid application filter. The firewall incorrectly interpreted the empty filter as match all cloud-apps , which caused the traffic to be denied. For more information: https://docs.paloaltonetworks.com/ngfw/release-notes/12-1/pan-os-12-1-5-known-and-addressed-issues/pan-os-12-1-5-addressed-issues
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