UEFI: Grub fails to download the kernel through HTTP but prints "error: ../../grub-core/net/efi/http.c:297:Fail to receive a response!" message

Solution Verified - Updated -


  • Red Hat Enterprise Linux 7 and later
    • HTTP Boot
    • UEFI


  • On UEFI systems, booting through HTTP fails with the following error if the Grub timeout is changed from 5 seconds to a larger value

    error: ../../grub-core/net/efi/http.c:297:Fail to receive a response! status=105.
    error: ../../grub-core/loader/i386/efi/linux.c:333:invalid magic number.
    error: ../../grub-core/loader/i386/efi/linux.c:207:you need to load the kernel first.


HTTP 1.1 with Keep alive needs to be configured on the HTTP server side.

If the HTTP server is Apache, the following stanzas need to be added in the HTTP server configuration file:

KeepAlive On
KeepAliveTimeout 600

Then the HTTP server restarted for changes to take effect.

Root Cause

The issue is expected, it's due to the HTTP connection initially opened by the EFI firmware to not be usable anymore, due to timeout.

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