Just discovered that admins are removing resource-content on the subreddit. Both the DPRK and China megathreads that are in the sidebar have been removed, probably others too.
I doubt this is unique to only /r/communism, /r/communism101 is probably going to be hit as well.
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Oh wow thank you for this tip, this is almost certainly the problem (back when I first set up this PC ipv6 was just getting pushed out with kind of a sloppy landing and I distinctly remember doing some "deep" tweaks to disable it, though I can't remember the specifics)