HP ILO X is the Hewlett Packard server management Integrated Lights Out software running independently from the main circutry of the host itself.  It allows remote management including power on/off, status checks, console etc.  This post goes over how to access the iLO interface when newer browsers such as Chrome, FireFox and Edge don't support the older TLS versions anymore.
 

First, use IETab to login. This works for most scenarios:

What if that doesn't work?  Or randomly crashes?  Let's try the console means.  Use SSH or PuTTy to login to the iLO interface:

# ssh Administrator@10.0.0.101:22

or PuTTy:

Once logged in, you should see:

Using username "Administrator".
Administrator@192.168.0.42's password:
User:Administrator logged-in to mdsesxi-ilo-p01.mds.xyz(192.168.0.42)
iLO 2 Advanced 2.33 at 14:56:47 Mar 20 2018
Server Name: mdsesxi-ilo-p01.mds.xyz
Server Power: On

</>hpiLO->

Next type help:

</>hpiLO-> help
status=0
status_tag=COMMAND COMPLETED

DMTF SMASH CLP Commands:

help    : Used to get context sensitive help.
show    : Used to show values of a property or contents of a collection target.
create  : Used to create new user account in the name space of the MAP.
 Example: create /map1/accounts1 username=<lname1> password=<pwd12345> name=
 <dname1> group=<admin,config,oemhp_vm,oemhp_rc,oemhp_power>

delete  : Used to delete user account in the name space of the MAP.
 Example: delete /map1/accounts1/<lname1>

load    : Used to move a binary image from an URL to the MAP. The URL is
limited to 80 characters
Example : load /map1/firmware1 -source http://192.168.1.1/images/fw/iLO2_130.bin

reset   : Used to cause a target to cycle from enabled to disabled and back to
      enabled.

set     : Used to set a property or set of properties to a specific value.
start   : Used to cause a target to change state to a higher run level.
stop    : Used to cause a target to change state to a lower run level.
cd      : Used to set the current default target.
 Example: cd targetname

exit    : Used to terminate the CLP session.
version : Used to query the version of the CLP implementation or other CLP
          elements.

oemhp_ping    : Used to determine if an IP address is reachable from this iLO 2.
Example : oemhp_ping /map1 192.168.1.1 , where 192.168.1.1 is the IP address that you wish
          to ping

oemhp_loadSSHKey    : Used to authorize a SSH Key File from an URL The URL is
limited to 80 characters
Example : oemhp_loadSSHKey /map1/config1 -source http://UserName:password@192.168.1.1/images/SSHkey1.ppk

HP CLI Commands:

POWER    : Control server power.
UID      : Control Unit-ID light.
NMI      : Generate an NMI.
VM       : Virtual media commands.
VSP      : Invoke virtual serial port.
VSP LOG  : Invoke virtual serial port data logging.
TEXTCONS : Invoke Remote Text Console on supported platforms.

</>hpiLO->

Note the TEXTCONS command above:

</>hpiLO-> textcons

Starting text console.
Press 'ESC (' to return to the CLI Session.

IMPORTANT: The exit keys are listed above. Some messages will be readable while others will not when host is booting:

Proc 1: Intel(R) Xeon(R) CPU E5540 @ 2.53GHz
Proc 2: Intel(R) Xeon(R) CPU E5540 @ 2.53GHz
QPI Speed: 5.8 GT/s
HP Power Profile Mode: Balanced Power and Performance
Power Regulator Mode: Static Low Power – Processor(s) clocked down to 1.60 GHz

Advanced Memory Protection Mode: Advanced ECC Support
Redundant ROM Detected – This system contains a valid backup system ROM.
Inlet Ambient Temperature: 21C/69F

SATA Option ROM ver 2.00.B12
Copyright 1982, 2008. Hewlett-Packard Development Company, L.P.
  Port1: (CD-ROM) DV-28S-W

Broadcom NetXtreme II Ethernet Boot Agent v6.0.11                 <F9 = Setup>
Copyright (C) 2000-2010 Broadcom Corporation
All rights reserved.
Press Ctrl-S to enter Configuration Menu
Integrated Lights-Out 2 Advanced
iLO 2 v2.33 Mar 20 2018 10.3.0.8

Slot 0  HP Smart Array P410i Controller      Initializing…  \

If the message below is seen:

Monitor is in graphics mode or an unsupported text mode.

Add in the following kernel boot options:

vga=normal nomodeset

to:

# cat /etc/default/grub
GRUB_TIMEOUT=5
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="rd.lvm.lv=rhel/swap crashkernel=auto rd.lvm.lv=rhel/root rhgb quiet net.ifnames=0 vga=normal nomodeset"
GRUB_DISABLE_RECOVERY="true"

Then stage the update:

# grub2-mkconfig –o /boot/grub2/grub.cfg

and reboot that Linux instance, then try again via textconsole:

Probing EDD (edd=off to disable)… ok                                      
Rocky Linux 8.5 (Green Obsidian)                                            
Kernel 4.18.0-348.el8.0.2.x86_64 on an x86_64                                                                                                          
Activate the web console with: systemctl enable –now cockpit.socket                                                                                    
dl380g6-p02 login:        

GL!

HTH,
TK

REF: https://docs.rockylinux.org/books/admin_guide/10-boot/