List of ports blocked on web browsers

The  list of all of the restricted ports on Chrome:

The  list of all of the restricted ports on Mozilla Firefox:

List of ports blocked on Chrome

Issue: Some ports generate an error (ERR_UNSAFE_PORT) when browsing to them via Chrome.

Resolution: Avoid below mentioned Ports while starting any services along with the port eg : 103.253.0.1:87/example.com:87

Reference Url: https://superuser.com/questions/188058/which-ports-are-considered-unsafe-by-chrome
Port   Services​
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
69,     // tftp
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
137,    // netbios
139,    // netbios
143,    // imap2
161,    // snmp
179,    // BGP
389,    // ldap
427,    // SLP (Also used by Apple Filing Protocol)
465,    // smtp+ssl
512,    // print / exec
513,    // login
514,    // shell
515,    // printer
526,    // tempo
530,    // courier
531,    // chat
532,    // netnews
540,    // uucp
548,    // AFP (Apple Filing Protocol)
554,    // rtsp
556,    // remotefs
563,    // nntp+ssl
587,    // smtp (rfc6409)
601,    // syslog-conn (rfc3195)
636,    // ldap+ssl
993,    // ldap+ssl
995,    // pop3+ssl
1719,   // h323gatestat
1720,   // h323hostcall
1723,   // pptp
2049,   // nfs
3659,   // apple-sasl / PasswordServer
4045,   // lockd
5060,   // sip
5061,   // sips
6000,   // X11
6566,   // sane-port
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]
6697,   // IRC + TLS
10080,  // Amanda

List of ports blocked on Mozilla Firefox

Issue: Some ports generate an error (This address uses a network port which is normally used for purposes other than Web browsing. Firefox has canceled the request for your protection.) when browsing to them via Mozilla Firefox.

Resolution: Avoid below mentioned Ports while starting any services along with the port eg : 103.253.0.1:87/example.com:87

Ref Url: https://www-archive.mozilla.org/projects/netlib/portbanning

Port    Service
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