The iLO Service Port is a new feature introduced with HPE Proliant Gen10 Servers. In order to access iLO5 through it, you would need a USB-Ethernet adapter. The iLO will always have 169.254.1.2 as link-local address.
Further information is available in the iLO5 User Guide (p. 246): https://support.hpe.com/
Further information is available in the iLO5 User Guide (see the link above) on page 250.
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