TCP 23 远程登录Telnet
常用端口号
TCP 21=文件传输,Back Construction,Blade Runner,Doly Trojan,Fore,FTP trojan,Invisible FTP,Larva, WebEx,WinCrash
TCP 22=远程登录协议
TCP 23=远程登录(Telnet),Tiny Telnet Server (= TTS)
TCP 25=电子邮件(SMTP)
TCP 80=超文本服务器(Http),
TCP 110=电子邮件(Pop3),ProMail