abnormal udp traffic detected, source port is zero

ZdenekB
ZdenekB Posts: 5
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edited April 2021 in Security
I install new fw 4.35 on ZyWALL 1100 and now I see in log alert 
Security Policy Control
- abnormal udp traffic detected, source port is zero, DROP
what is port "zero" ? Where I config this rule ?

Thanks Zdenek

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