Following the upgrade of the Unified Access Gateway and Horizon Connection Server from version 2303 to version 2306 or 2309, it may no longer be possible to establish a connection between the two servers.
This anomaly can be checked in the menu Servers – Gateways :
In order to establish the connection between the connection server and the UAG, the following parameters must be added to the file portalHost.properties in “C:/Program Files/VMware/VMware View/Server/sslgateway/conf” of the connection server:
portalHost.properties
enableCORS=false
portalhost.1=UAG URL
portalhost.2=CONNECTION SERVER URL
Once the file has been saved, it will be necessary to restart the connection server.
Finally, check that the connection was successful: 
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