各位网络高手，今天下午我的电脑装的nortan internet security显示
我被一个ip为172.18.133.245企图用特洛伊木马连接，然后过了不多久，我
的网络端口显示断了，再也不能用了。这是被黒客攻击还是被cc在扫描呀。。。谢了。。。

It seems to me that you don't even understand how Trojan horses works from your description. Please check out the basic network security knowledge before trying to use advanced tools. It will just be a waste of time and worry yourself if you don't understand the reports generated by those tools, which are usually designed to be paranoid, and report many problems that are not problems in the specific environment of NUSNET.