(Error code 0216ea)
This error originated from one of the following locations within the iPXE source code:
DEBUG=x509
(Please edit this page to include any of your own useful hints and tips for fixing this error.)
This is an old revision of the document!
iPXE has case sensitive compare of hostname when validating certificate, so make sure the casing in your urls used in iPXE matches the one in certificate.
So if a certificate is for boot.ipxe.org then https://BOOT.IPXE.ORG will not work in iPXE.
The reason for this is how certificates are compared in iPXE and there is no clean good solution for how to fix this.