If you are running a transparent HTTP proxy on your network, you may have trouble with running Internet Recovery and Apple Hardware Test on Macs that support it. You’ll see a “-4403D” or “-4403F” error. For some reason, Apple’s servers return a 403 when they see the “via” header that many proxy servers send. Here’s the configuration I used in Squid to turn off that header. I also disabled the “forwarded-for” header – essentially, this makes it impossible for servers to determine that the request is coming through a proxy server:
1 2 3 4 5 | # Be more anonymous forwarded_for transparent via off visible_hostname proxy.local httpd_suppress_version_string on |
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