HP Procurve Auto DoS features blocking UEFI PXE Boot, NTP and SYSLOG

If you enable the Auto DoS feature on later 1920 Office Connect models, traffic is blocked based on one of these conditions:

  • the source port (TCP / UDP) is identical to the destination port (NTP, SYSLOG, etc)
  • the source port (TCP / UDP) is ‘privileged’ thus in the range of 1 -1023

You can find/disable it in the section “Security” and then “Advanced security”.

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