Switch boot from tftp to http for Debian

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Hi everyone,
We got it working. Here are the points that contributed to the solution. I hope they will be useful to some of you.

  1. The message “Error: Access forbidden, only HTTPS connections are allowed” was not caused by the Smartproxy but was a message from the client. Somehow, we assumed the whole time that the message was generated by the Smartproxy, so we looked for the error in the Smartproxy and not in the client.
  2. We then tested it with a UEFI BIOS that allows HTTP. At first, it only worked with the IP of the Smartproxy, which we adjusted in /var/lib/dhcpd/dhcpd.leases until we entered the correct name servers for the subnet in custom-hiera.yaml. After that, the installation ran without any further adjustments.
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