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Knowledge Base

Untrusted connection message connecting with the Horizon Client to the server (75078)

Last Updated: 10/24/2023Categories: TroubleshootingTotal Views: 19715Language:
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Symptoms

There is an untrusted connection prompt that cannot be bypassed.

Important: Your Horizon Server is installed by default with a self-signed certificate.
VMware strongly recommends that you configure TLS certificates that are signed by a valid Certificate Authority (CA) for use by Horizon Connection Server instances
Documentation: Obtaining TLS Certificates from a Certificate Authority

Cause

This can occur due to the requirements for trusted TLS server certificates that have been changed by Apple in macOS 10.15, iOS 13, and Chrome OS 76 or later. The default self-signed certificates do not currently meet these new requirements.

Note: If the connection to Horizon from a client is through an intermediate load balancer or proxy that terminates TLS, the new certificate requirements must also be met on those devices.

Note: This may apply to other O/S types as requirements are updated over time. We do encourage the usage of a signed certificate

Resolution

To resolve this issue replace the certificate with a CA signed certificate that meets the requirements.

For information on these requirements, see https://support.apple.com/en-us/HT210176

Update 2021 : Apple has now further enhanced requirements, please see  https://support.apple.com/en-us/HT205280 for details.

Workaround

To work around this issue, set the macOS and iOS Horizon clients to not verify server certificates.

Detectable by VMware SkylineTM

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