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Firefox 66.0.4 Rhythm Box Uses Port 0 For Web Control - Firefox Blocks this port - workaround?

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I am trying to use Rhythmbox's web interface and that uses port 0. Firefox is blocking access to that port. I have tried adding network.security.ports.banned.override set to 0 (and restarting firefox), but that appears to make no difference.

I am trying to use Rhythmbox's web interface and that uses port 0. Firefox is blocking access to that port. I have tried adding network.security.ports.banned.override set to 0 (and restarting firefox), but that appears to make no difference.

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I don't know if port 0 is a valid port number in Firefox. It isn't specifically part of the build in blocked port list, but is used to mark the end of the bad port list.