I believe it’s an old question but after a few days searching online I still could not solve this problem,
Warning: Cannot connect to online repository (mirror.freepbx.org). Online modules are not available.
However with the same server, if I shift it to another network with static IP internet service, everything is fine.
I have tried over a few dynamic internet broadband and the results are all the same.
Since same server results in different results under different types networks, I assume there is nothing wrong with the server.
I can ping mirror,freepbx.org through both the server and my notebook under any network.
I can serve net and do all other jobs under any network.
Pan Tone Communications. (Pte) Ltd.