Got ARM trial installed and configured, but when I try to run any scans it tells me the collector is not available. In the configuration screen it shows the collector connected. Everything is on a single server.
The hostname for the server was too long, once I shortened it then everything worked fine.
Since it's a single server, this shouldn't be an issue. But I've seen systems stuck in some weird states where a simple service restart helped.
Have you tried restarting the ARM Service?