[ossec-list] Unstable ossec connections

[Henry]

I have been setting up with a ossec server and a ossec agent
installed.  I can use the syscheck_control -lc command on server side
to see the agent.  But usually after several hours without
disruptions, the syscheck_control -lc command cannot see the agents.
The only thing I can do is to restart the ossec agent and then restart
the ossec server, then I can locate the agent using the
syscheck_control -lc command. Any help is appreciated.