Re-negotiation Handshake Failed

I've had some trouble troubleshooting a problem with a site. Regular browsers had no problem, and the certificate appeared fine. However, Bingbot was getting failure (503) on trying to access robots.txt. Once I allowed that to be available via http, the problem went away. Looking further I found some ideas:

Turns out there was a problem when updating the LetsEncrypt certificate that it created a new cert but did not rewrite to the ssl.conf file. I manually edited to that old one, then recreated the cert again (which it automatically shifted to the first cert/priv/chain filenames, but this time did rewrite those urls in ssl.conf).

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