There have been some reports about, users who are trying to connect to a web server with different ports but getting an error “ ERR_UNSAFE_PORT ”. This is because of using the unsafe port on your browser, which is not letting you through for security purpose.
Error Code: ERR_UNSAFE_PORT
What causes the ERR_UNSAFE_PORT error?
This error is caused because your browser is stopping you to access the unsafe ports. Web developers are aware of the security and that browser is incredibly obliging to attackers when it comes to making a request on servers on your behalf. Through the unsafe ports, attackers can trick the web browser into something that can be harmful for the user.
Allowing Unsafe/Restricted ports on your Browser
To fix this error, you need to explicitly allow the unsafe ports that you are trying to access on your browser. Different browsers will have different methods of allowing restricted ports access. Below we will guide you about Chrome and Firefox methods:
For Chrome:
To allow ports in chrome, you just need to go in the properties of Chrome shortcut and add the following line in the shortcut target with the port you want to access.
- Right click on Chrome Shortcut
- Select Properties
- Now Append — explicitly-allowed-ports=xxx to shortcut target Example: C:\Program Files (x86)\Google\Chrome\Application\chrome.exe –explicitly-allowed-ports=6666 Adding the line in the target path Note : there are two ” – – ” dash without spaces before the word explicitly. You can also add multiple ports by using the comma between them.
For Firefox:
For Firefox, you can allow the ports by using the network.security.ports.banned.override . But the updated versions of Firefox doesn’t contain this option in their about:config by default. So you have to add this manually.
- Type “ about:config ” in the URL
- Now right-click on the list and select New>String Adding new string
- Then create a string with the name “ network.security.ports.banned.override ” Adding the network.security.ports.banned.override
- In value, you can add ports by these methods 1-65535 (All Ports) 87,88,89,1050 (for few ports with commas) Ports for the string value
Restricted ports on 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
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)
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]
6697, // IRC + TLS
Restricted ports on Firefox:
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
587, // stmp?
601, // ??
636, // ldap+ssl
993, // ldap+ssl
995, // pop3+ssl
2049, // nfs
3659, // apple-sasl / PasswordServer
4045, // lockd
6000, // X11
