I have been going through the process of replacing the security servers on my homelab over the weekend with Universal Access gateways (UAG). The process has been fine and to be honest very straight forward.

There is no point me going though the install process as Carl Stalhood has a excellent walkthough on his blog https://www.carlstalhood.com/vmware-unified-access-gateway/

One issue that i did have after the installation and configuration of the UAG was access to my Horizon Admin Page /admin and /newadmin after the installation.As i dont access it local from the connection server, what i had forgotten was to do the following:

For each connection server create a text file named locked.properties in “Location Where you have installed Horizon View”\Server\sslgateway\conf

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Open or Create a locked.properties file using a plain text editor.
Add this line:

checkOrigin=false

Note: Ensure the locked.properties file is not in .txt extension after saving.
 
Save and close the file.
Restart the VMware Horizon View Connection Server service.

Once this was done i could login to my Horizon Admin page, there is a Vmware KB article at https://kb.vmware.com/s/article/2144768