Thanks for helping me confirm this friends. To close the loop, I sent an email to icloudad...@apple.com and the problems appear to have halted very early this morning (US/Central).

On 2024-01-17 03:13, Dan Malm via mailop wrote:
On 2024-01-17 08:47, Jarland Donnell via mailop wrote:
Just a quick sanity check, are others seeing intermittent failure to reach iCloud servers? My logs are filled with:

450 Error connecting to 17.57.156.30. Unexpected socket close

I've been having trouble delivering mail to them for at least 12 hours. I hope it's not just me, but it would help to know if it is.
Seeing the same from multiple icloud IPs:
17.42.251.62
17.57.156.30
17.57.154.33
17.57.152.5
17.57.155.34

Connection gets cut randomly. I see it happening on banner/ehlo/mail/rcpt

But some other ips work, so mails do get delivered eventually.

Looking at my logs this seems to be a long-running issue with icloud, but at a much smaller scale than now. I've got 30 days worth of logs and I can see these errors happening throughout the whole timespan, though at a much smaller scale; just a handful of errors per day. The current larger issues seem to have started around 2024-01-16 20:00 UTC
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