I am not sure whether this is two issues run together in the logs, or one. Wordfence reported the following:
Wordfence can't get the IP of clients and therefore can't operate. We received IP: 0. X-Forwarded-For was: REMOTE_ADDR was: Report the following on the Wordfence forums and they may be able to help. Headers that may contain the client IP: SSH_CLIENT => 75.xx.x.xxx 43172 22 SSH_CONNECTION => 75.xx.x.xxx 43172 67.xxx.xx.xxx 22It seems to me these might be two issues: one about unreadable IPs (not sure what that's about - maybe Cloudflare?), another about a nearby SSH connection? Anyway, I was SSH'd in to my server, so the SSH_CLIENT was me, and the 67.xxx.xx.xxx was in fact my server.
Just reporting, as Wordfence requested. :-)
Thanks for the rock-n-roll plugin!