Fix: ERR_UNSAFE_PORT
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.
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
