True, I don't want the internet connecting to my printer. Just opened it up so that I could get some help here. It's locked down now.
Thanks everyone for the help and suggestions. I installed the 0001_chain.pem, and that fixed the issue.
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I'm glad you got this working!
FWIW, if you run into compatibility issues in the future (which is likely with printers and other embedded devices when they reach End Of Support as browsers increase their minimum TLS protocols) a popular workaround is to drop the device's traffic to HTTP AND put a microserver or other device in front of it to handle the HTTPS.
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