Firewall installed in my computer (Norton symantec)

maple2000 (冬眠的枫叶)
sometimes warns me my pc has been attacked by Trojan horse, that gives me an impression that Trojan horse could be planted via TCP/UDP/HTTP and other legitimate ways. I am kind of confused by their warning message then. You name email is one of the legitimate ways to plant a Trojan, other networking activities such as UDP/TCP access could also be used as a way to sneak Trojan horses to the pc?

I appreciate your time! Thanks.
2002-2-7 -04:00
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