The Connection server Administrator dashboard shows a red error status
Solved: I have a view connection server and a view security server.
Log in as an administrator to the server that is running the VMware View Connection Server or VMware View Security Server. Click Start > Run ...
... service on a Connection Server host, or the VMware Horizon View Security Server service on a security server, and click Stop, Restart, or Start as appropriate.
50 articles that fix EVERYTHING in Horizon View!
Horizon Connection Server and Security Server Resources. Resource
Then restart the VMware Horizon View Connection Server service.
Note Starting with Horizon 7.0, View Agent is renamed Horizon Agent.
Here is an update for the top Horizon View articles list for April 2016.
8 HTTP Protection Measures on Connection Servers and Security Servers 38