PAN-OS: Invalid URLs in an External Dynamic List (EDL) can Lead to Firewall Outage

Certain invalid URL entries contained in an External Dynamic List (EDL) cause the Device Server daemon (devsrvr) to stop responding.

This condition causes subsequent commits on the firewall to fail and prevents administrators from performing commits and configuration changes even though the firewall remains otherwise functional. If the firewall then restarts, it results in a denial-of-service (DoS) condition and the firewall stops processing traffic.

Work around:
You can prevent this issue by removing all invalid URL entries from source EDLs or removing the EDL from your configuration.

Additionally, do not configure EDLs from websites that you do not trust.