Receiving error 'This address is restricted' when using Firefox when connecting to a device not using port 80

Error Message

When connecting to a device that is no longer using port 80 with Mozilla Firefox, you receive the following error message:

error-smaller.jpg

 

Solution

Open Mozilla Firefox.

In the address bar, type: about:config

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This will take you to a page that looks similar to this:

about-config.jpg

 

In the search box type:

network.security.ports.banned.override

You may find that the search doesn't find anything, if this is the case, follow the steps below, if it does find a matching result skip the steps directly below.

If no result is returned when searching for: network.security.ports.banned.override then you will need to make a new string. To do this:

Right click in the blank search area and select 'New' then 'String'.

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You will see a pop-up box appear asking for the new string value. "Enter the preference name". The name needs to be 'network.security.ports.banned.override'

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Once this has been entered, select 'Ok'. You will then get another box pop up saying 'enter string value'. This is effectively asking which port/s you wish to open.

ports.jpg

Within this box you have a few ways of specifying the ports you require. These are:

Simply just one port number i.e. 116

Multiple port numbers (please separate the ports using a comma) i.e: 116,554,81

limited Port range i.e. 81-116
Full Port range i.e. 1-65535

This should now stop the error message being displayed upon connecting to your device.

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