On ESXi 7.0, you can import a custom certificate and key.

1. Enable SSH
   1. SCP the PEM format certificate certificate.crt to esxiserver:/etc/vmware/ssl/
   2. SCP the PEM format private key private.key to esxiserver:/etc/vmware/ssl/
2. SSH into the ESXi server
   1. cp /etc/vmware/ssl/rui.crt /etc/vmware/ssl/rui.crt.backup
   2. cp /etc/vmware/ssl/rui.key /etc/vmware/ssl/rui.key.backup
3. Replace the certificate and key
   1. cp /etc/vmware/ssl/certificate.crt /etc/vmware/ssl/rui.crt
   2. cp /etc/vmware/ssl/private.key /etc/vmware/ssl/rui.key
4. Restart services services.sh restart.