discovery blocked by antivirus

discovery blocked by antivirus

hello, one of my customer got a bizzare issue,
he is using the following antivirus:

Trend Micro version 7.3

while this antivirus is on, he cannot discover this PC,
but once it is removed , the discovery goes on correctly,

i am going to simulate that in my lab, but wanted to know if anyone has alrady come across similar issues...







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