1 Problem Description

Write a new Spring Boot project with the project port number defined as 6667. The project starts normally, but an ERR_UNSAFE_PORT error occurs when you enter the access address in Chrome. This literally means an unsafe port number.

2 Cause Analysis

The Chrome browser defines built-in ports that cause the ERR_UNSAFE_PORT problem if the address port number you want to access is the same as those built-in ports.

Chrome defines the following built-in ports 1:

  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
  6666, // Alternate IRC
  6667, // Standard IRC
  6668, // Alternate IRC
  6669, // Alternate IRC
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3 Solutions

  1. Change the port number for engineering applications. (recommended)

  2. In the Chrome shortcut command, add the port number. The format is: — minority-allowed-ports = Port number

  1. Blog.csdn.net/kjcxmx/arti…↩