If VMware HA doesn’t work. Verify that host name is lowercase: hostname; hostname -s Verify that host name in /etc/hosts is lowercase Verify that search domain in /etc/resolv.conf is in lowercase Verify that host name in /etc/sysconfig/network is fqdn, all lowercase Verify that the host name in esx.conf is fqdn, all lowercase Verify that host name in DNS is lowercase: nslookup; <short hostname> (should properly resolve fqdn of host, all lowercase) Verify that all primary service consoles have the same name. Verify that all primary service consoles are in the same IP subnet. If VMotion vmkernel port is on same vSwitch as primary service console, use das.allowVmotionNetworks=1 If host has multiple service consoles, use KB 1006541 and the das.allowNetwork0 HA option to ensure that only the primary service console is allowed. Verify that customer has appropriate licensing for HA, and has available licenses: In LM Tools, perform a status inquiry, verify ...