Destiny has worked great on Steam for me up until a few days ago. Whenever I try to start the game now, it gives me the centipede error code. This code implies that it can't connect to game servers, but I'm able to sign in alright.
I'm able to play just fine on my Xbox Series X in the living room - same network, so it's not an issue of NAT I don't think.
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how often do you reboot the modem/router? do it regularly. unplug it for a full minute and plug it back in. also try clearing the steam cache/temp files (google it).