To provide load-balancing there is some way to do that, but I don't think a specific failover technology for the connection server is highly necessary. Suppose that if you lose the View Connection Server temporarily, the existing connections are still stablished and no need to reconnect them at that moment. For the other new connection requests, if it's critical you can install the View Direct Agent in the template VM for deploying new desktops and grant access to the users if there is no connection server! (not exactly maintain availability, but is a simple and useful method). However, don't forget the connection server is just a Broker and can be re-deploy this service very fast (if you don't lose the LDAP database VDMDS) and also there are many other reasons that I think there is no need for that.
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