I asked a question (Can't connect to remote centos 7 install from at least one hostCan't connect to remote centos 7 install from at least one host) that has for whatever reason resolved itself after almost a day of not using the affected computer. I was going to do more troubleshooting just now but discovered that the problem went away.
I would delete this question if not for the answer that is/was not relevant.
What should be done in this case?