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Which ports are considered unsafe in browsers?

by admin on February 18th, 2015

Some ports are considered unsafe in browsers and they will block any packet to these ports.

you will receive unsafe port error or “This address uses a network port which is normally used for purposes other than Web browsing. Firefox has canceled the request for your protection.” varies by browser…

You have to be careful when starting a (web) application on any of that ports.

The list of unsafe ports is:

1)Chrome:

  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]

Firefox:
1 tcpmux
7 echo
9 discard
11 systat
13 daytime
15 netstat
17 qotd
19 chargen
20 ftp data
21 ftp control
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 submission
601 syslog
636 LDAP+SSL
993 IMAP+SSL
995 POP3+SSL
2049 nfs
4045 lockd
6000 X11
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