Step 1: Place the host you are upgrading into Maintenance Mode.
Step 2: Then SSH into the host using PuTTY (or any other SSH client/terminal).
Step 3: Type the following command to open the firewall for outgoing HTTP requests
esxcli network firewall ruleset set -e true -r httpClient
Step 4: Type the following command to download and upgrade to ESXi 6.5 U1
esxcli software profile update -d https://hostupdate.vmware.com/software/VUM/PRODUCTION/main/vmw-depot-index.xml -p ESXi-6.5.0-20170702001-standard
Step 5: After the update has finished disable the HTTP firewall rule by typing
esxcli network firewall ruleset set -e false -r httpClient
Step 6: And finally, reboot the ESXi host to complete the upgrade.
reboot
Step 7: Doesn’t hurt to also disable SSH when you’re done for security purposes.
Right-click host object – Services – Disable SSH
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