Event "Network attack detected"

[ssv]

Got this alert Event "Network attack detected" without source of attack.

Previously it was source in same alerts, but last time I got alert without source IP, why?

 

Result\Name:     Scan.Generic.PortScan.TCP

Object:     TCP from several different sources

Object\Type:     Network packet

Object\Name:     TCP from several different sources

Object\Additional:

Suspicious:

 

[DonKid]

Please, open a ticket here.