macOS client can’t download Apple updates

This is a really odd situation. I have one client machine that cannot download a particular Apple update. This is the error message that comes up:

softwareupdate -d -a
Software Update Tool

Finding available software

Error downloading Security Update 2017-002: The Internet connection appears to be offline.
Done.

Error downloading updates.
Here are two things that make this situation weird:
  1. The machine can contact any random website, including Apple's.
  2. The machine eventually could even download and install the Safari update from the Apple servers.
I haven't found a real solution to this yet, and it affects only one client, but I did find a workaround, which was to just use Reposado with it.

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