Fault phenomenon: In UEFI mode, when you reboot after installing ESXi on the host, the reboot may fail. This issue occurs with an error message similar to the following: An unexpected network error has occurred. No boot device available (Unexpected network error. No boot device available).

Cause analysis: The host system does not recognize the disk on which ESXi is installed as a boot disk.

Solution:

1. When the error message is displayed on the screen, press F11 to display the boot options.

2. Select an option similar to Add Boot Options. The text for this option may vary depending on your system.

3. Select the file \EFI\BOOT\BOOTx64.EFI on the disk where ESXi is installed.

4. Change the boot order so that the host boots from the added options.