When deploying a Unified Access Gateway for VMware Horizon in my lab environment I ran across an issue where the Horizon Destination Server would not connect despite the correct certificate thumbprint being used. The Horizon server is version 2111.2 and the UAG is version 21.11.2.

The destination Horizon certificate was signed with sha256 and the UAG is able to use that certificate based on the documentation. For fun I changed the “sha256=” to “sha1=” and the UAG is now able to connect to the Horizon destination server.