6.5.1

Table Of Contents
Company policy often does not allow intermediate CAs. For those cases, hybrid deployment is a good
solution. It minimizes the number of certificates to replace, and secures all traffic. The hybrid deployment
leaves only internal traffic, that is, solution user traffic, to use the default VMCA-signed certificates
ESXi Certificate Replacement
For ESXi hosts, you can change certificate provisioning behavior from the vSphere Web Client. See the
vSphere Securitydocumentation for details.
Table 33. ESXi Certificate Replacement Options
Option Description
VMware Certificate Authority mode (default) When you renew certificates from the vSphere Web Client,
VMCA issues the certificates for the hosts. If you changed the
VMCA root certificate to include a certificate chain, the host
certificates include the full chain.
Custom Certificate Authority mode Allows you to manually update and use certificates that are not
signed or issued by VMCA.
Thumbprint mode Can be used to retain 5.5 certificates during refresh. Use this
mode only temporarily in debugging situations.
Where vSphere Uses Certificates
In vSphere 6.0 and later, the VMware Certificate Authority (VMCA) provisions your environment with
certificates. Certificates include machine SSL certificates for secure connections, solution user certificates
for authentication of services to vCenter Single Sign-On, and certificates for ESXi hosts.
The following certificates are in use.
Table 34. Certificates in vSphere 6.0
Certificate Provisioned Comments
ESXi certificates VMCA (default) Stored locally on ESXi host
Machine SSL certificates VMCA (default) Stored in VECS
Solution user certificates VMCA (default) Stored in VECS
vCenter Single Sign-On SSL
signing certificate
Provisioned during installation. Manage this certificate from the vSphere Web Client.
Do not change this certificate in the filesystem or
unpredictable behavior results.
VMware Directory Service (VMDIR)
SSL certificate
Provisioned during installation. Starting with vSphere 6.5, the machine SSL certificate
is used as the vmdir certificate.
ESXi
ESXi certificates are stored locally on each host in the /etc/vmware/ssl directory. ESXi certificates are
provisioned by VMCA by default, but you can use custom certificates instead. ESXi certificates are
provisioned when the host is first added to vCenter Server and when the host reconnects.
Platform Services Controller Administration
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