Here is a quick guide on how to remove Firefox's error message when trying to access resources on restricted ports, such as port 87:
This address is restricted
This address uses a network port which is normally used for purposes other than Web browsing. Firefox has canceled the request for your protection.
Open Firefox's preferences by typing the following URL in Firefox:
In the Filter box, type in
If you can't find such a preference, right click to open up the pop-up menu and pick New and then String.
As preference name type
network.security.ports.banned.override and 87 as the value.
Afterwards it should look something like this:
If such a preference already exists, you can specify multiple ports. Either as a range such as 1-1024 or even combine with a comma separated list such as 87, 150-300, 350, 400, 450-500.
Just refresh the page and you should have no problems accessing the resource.
Sriharsha CR, Sunday, May 18, 2014 1:28 PM
Good Idea.., I've set the sting value 1-1024 & that's working... Thank U :)
Bomyne, Thursday, May 15, 2014 10:55 AM