A late follow up to this. Updating the certificate made no difference. I am using a third party certificate and it is current and valid. To "fix" it, I backed up my splunk configs, deleted the drive, reinstalled, and put the configs back again. Now it works. Something about the 8 to 9 upgrade just doesn't work. Reinstalling is easier than finding out what went wrong. Fortunately I only have to go through that once. The 9.x updates have not given me any further trouble.
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