I install test environment on my virtual machine.I've sucesful instal Rhq 4.2. Now i want to install agent on the same machine. I've install agent and when i finished config it i see
The setup has been completed for the preferences at node [/rhq-agent/default].
!!! There are  servers that are potentially unreachable by this agent.
Please double check all public endpoints of your servers and ensure
they are all reachable by this agent. The failed server endpoints are:
See the Administration > High Availability > Servers in the server GUI
to change the public endpoint of a server.
THIS AGENT WILL WAIT UNTIL ONE OF ITS SERVERS BECOMES REACHABLE!
The agent will now wait until it has registered with the server...
I see this agent in Administration tab then Topology-> Agents.
but nth in inventory -> discovery queue
Should I turn on (and how) High Availability to find that agent?
I don't see High Availability section in Administration Tab
The GUI page has changed in recent versions and we need to change the agent message to point to the correct place. Its Adminstration>Server now (I wrote up BZ 783997 for that).
Read the high availability wiki page for the full details on this. for your specific error, the server is advertising itself on a bad hostname that your agent cannot DNS resolve (ubunturhq4.2 - that is not a hostname your agent can resolve to a proper IP address). Change the public endpoint address of your server. Read the following sections on that high availability wiki page for details:
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