Accept the Thumbprint of a Default TLS Certificate

When you add a vCenter Server to Omnissa Horizon 8, you must ensure that the TLS certificates that are used for vCenter Server are valid and trusted by Omnissa Horizon Connection Server. If the default certificates that are installed with vCenter Server are still in place, you must determine whether to accept these certificates' thumbprints.

If a vCenter Server is configured with a certificate that is signed by a CA, and the root certificate is trusted by Horizon Connection Server, you do not have to accept the certificate thumbprint. No action is required.

If you replace a default certificate with a certificate that is signed by a CA, but Horizon Connection Server does not trust the root certificate, you must determine whether to accept the certificate thumbprint. A thumbprint is a cryptographic hash of a certificate. The thumbprint is used to quickly determine if a presented certificate is the same as another certificate, such as the certificate that was accepted previously.

For details about configuring TLS certificates, see Configuring TLS Certificates for Horizon 8 Servers.

You first add vCenter Server in Omnissa Horizon Console by using the Add vCenter Server wizard. If a certificate is untrusted and you do not accept the thumbprint, you cannot add vCenter Server.

After these servers are added, you can reconfigure them in the Edit vCenter Server dialog box.

Note: You also must accept a certificate thumbprint when you upgrade from an earlier release and a vCenter Server certificate is untrusted, or if you replace a trusted certificate with an untrusted certificate.

On the Horizon Console dashboard, the vCenter Server icon turns red and an Invalid Certificate Detected dialog box appears. In Horizon Console, click Settings > Servers and select the vCenter Server. Then, click Edit in the vCenter Server settings and follow the prompts to verify and accept the self-signed certificate.

Procedure

1. When Horizon Console displays an Invalid Certificate Detected dialog box, click View Certificate.

2. Examine the certificate thumbprint in the Certificate Information window.

3. Examine the certificate thumbprint that was configured for the vCenter Server. See vCert - expired certificate replacement script for details.

4. Verify that the thumbprint in the Certificate Information window matches the thumbprint for the vCenter Server.

5. Determine whether to accept the certificate thumbprint.

   Option	Description
   The thumbprints match.	Click Accept to use the default certificate.
   The thumbprints do not match.	Click Reject. Troubleshoot the mismatched certificates. For example, you might have provided an incorrect IP address for vCenter Server.