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Your Oxidized-server would need to be able to connect to the LibreNMS API. If you are using a self-signed cert, I am not sure if the Oxidized will accept it but you can try. I personally just use plain http between the Oxidized and LibreNMS since in my case the servers are in a private network anyway.
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You can not open the /api/v0/oxidized with a browser without passing the authentication header.
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The get config button works by initiating a connection to the Oxidized API (from LibreNMS Web-server to the Oxidized-server). You will need to configure the correct address for this in the LibreNMS.
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Check the routing and firewalls between LibreNMS and Oxidized servers.