For the giggles, I'll add to this.
Since launch, I have seen a total of one human player in Open Play.
I have been to Sol, LHS 3447, and a few dozen systems in between.
I can watch a twitch stream, see the guy is in LHS 3447, and he'll see 10 people in Supercruise.
I go there, no people.
I have logged in and out countless times, jumped in and out countless times, reset my router, verified Upnp enabled, removed my router, forced UDP port forwarding and updated the config file to reflect the change, my firewall is already disabled, disabled anti virus, uninstalled the game and any remaining registry entries or lingering files of it, reinstalled, removed the config file and validated the game files, and installed Elite onto my backup gaming rig.
I even contacted my ISP to request an IP change and to verify they are not blocking any ports on my connection.
I have still only seen one human player in Open Play since the 16th, and only for a few moments before they vanished from my radar.
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I opened a ticket for it, it received a fairly quick response. All they requested was adding some extra logging info to my config file and to submit it. I did so, they said "Thanks. Ticket closed."
Uhm, you're welcome?
So...
Yep. There may be a slight hiccup somewhere.