Watch for a bogus handshake; I saw this happen on one of the FEs, we did
a handshake even though capserver was not running. But the uid/gid values were totally bogus. So sanity check them, and if they look whacky, abort the handshake until the next time we wake up, to do it again. I go no good theories as to how this happened. A bad theory is that maybe some transient startup process bound that socket for a while, but that seems incredibly unlikely.
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