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Well this was a fun one. This is a small test box and I wasn't running anything actively at the moment, so I didn't notice that a change that was done (not by me) to a firewall between this and the internet had broken the internet connectivity. Even though it was only trying to communicate with itself, via IP as far as I can tell, it must have been trying to do something with DNS at some point in the handshake (DNS was set to 8.8.8.8, which it couldn't reach). Restored connectivity and restarted services, and it's fine now.