When you got the problem, it sayClassNotFoundException, com.hp.ilo2.remcons.remcons.class, while accessing remote console of HP server that still use the Integrated Lights-Out 2 (ILO2). Remote console uses the option: Access the system KVM from a Java applet-based console requiring the availability of a JVM.
The problem as figure below:
How to make enable direct console or SSH connect in ESXi 5 and 6.
Different with VMware ESX/i 4.1 and older, In the VMware vSphere ESXi 5.0 and newer ( 5.1, 5.5, and ESXi 6) you can't access the ESXi shell or remote using SSH because by default the settings are disable.
To make enable accessing ESXi Shell by direct or remote using SSH :
1. Go directly to the host
2. Press F2 Key (Customize System/View Logs)
3. Login using Administrator/root account.