Try this: https://www.bungie.net/7_How-do-I-clear-the-cache-on-my-console/en/Help/Article/12539
Also your NAT needs to be set to Open or 1.
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Trying it now, hopefully it works. My NAT has always been type 2 and I've played since release, one day it just started giving me the message every time I try to play.
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I hope it works for you.