Enable SSH access on your host, log in to it (e.g. using putty) and run the following commands:
# open firewall for outgoing http requests: esxcli network firewall ruleset set -e true -r httpClient # Install the ESXi 5.5 U1 Imageprofile from the VMware Online depot esxcli software profile update -d https://hostupdate.vmware.com/software/VUM/PRODUCTION/main/vmw-depot-index.xml -p ESXi-5.5.0-20140302001-standard # Reboot your host rebootThis will also work if you are still on ESXi 5.0 or 5.1. For more detailed instructions and useful hints regarding ESXi 5.5 please read my post How to update your standalone host to ESXi 5.5 - beware of missing drivers and do NOT upgrade virtual hardware!
This post first appeared on the VMware Front Experience Blog and was written by Andreas Peetz. Follow him on Twitter to keep up to date with what he posts.