端口 原因 1 tcpmux 7 echo 9 discard 11 systat 13 daytime 15 netstat 17 qotd 19 chargen 20 ftp data 21 ftp access 22 ssh 23 telnet 25 smtp 37 time 42 name 43 nicname 53 domain 77 priv-rjs 79 finger 87 ttylink 95 supdup 101 hostriame 102 iso-tsap 103 gppitnp 104 acr-nema 109 pop2 110 pop3 111 sunrpc 113 auth 115 sftp 117 uucp-path 119 nntp 123 NTP 135 loc-srv /epmap 139 netbios 143 imap2 179 BGP 389 ldap 465 smtp+ssl 512 print / exec 513 login 514 shell 515 printer 526 tempo 530 courier 531 chat 532 netnews 540 uucp 556 remotefs 563 nntp+ssl 587 stmp? 601 ?? 636 ldap+ssl 993 ldap+ssl 995 pop3+ssl 2049 nfs 3659 apple-sasl / PasswordServer 4045 lockd 6000 X11 6665 Alternate IRC [Apple addition] 6666 Alternate IRC [Apple addition] 6667 Standard IRC [Apple addition] 6668 Alternate IRC [Apple addition] 6669 Alternate IRC [Apple addition]
避开规则不如遵守规则，不使用不允许的端口
