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Firefox enable 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.

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.

  1. Type “about:config” in the URL
  2. Now right-click on the list and select New>String
  3. Type in “network.security.ports.banned.override
  4. in value, you can add ports by these methods
1-65535 (All Ports)

87,88,89,1050 (for few ports with commas) 

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