title: Failed to monitor another Vm using zabbix agent
body: <p>I'm trying to monitor a virtual machine from another.  have two ubuntu virtual machines one with the zabbix server and another with the zabbix agent.
  but after setting up my agent by using my public ip i get this error :<code>Received empty response from Zabbix Agent at [192.168.x.x]. Assuming that agent dropped connection because of access permissions.</code></p>
  <p>in  <code>/etc/zabbix/zabbix_agentd</code>  i changed my server to <code>server= 127.0.0.1,192.168.x.x</code>
  and i turned off my firewall just in case.</p>
  <p>My agent status:
  <a href="https://i.stack.imgur.com/dg5Ie.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dg5Ie.png" alt="enter image description here" /></a>
  If you are familiar please help
  and /var/log/zabbix_agentd.log</p>
  <p><a href="https://i.stack.imgur.com/bPt1H.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/bPt1H.png" alt="enter image description here" /></a></p>