title: zabbix_sender: send value error: ZBX_TCP_READ() timed out
body: <p>I have some problems sending my test data to Zabbix Server.</p>
  
  <p>My configurations are set up, even have Zabbix agent installed and correctly working (sends data for monitoring CPU, memory,...).</p>
  
  <p>This is the situation: I have a Zabbix installed on a Debian VM, and configured a host with correct IP, port, item(Zabbix trapper).
  I want to send a value just for testing from my Windows 10 PC using "zabbix_sender"; later I want to find a way to get data from a .txt file for monitoring.</p>
  
  <p>Used command from my cmd:</p>
  
  <p>zabbix_sender -vv -z XXX.XXX.X.X -p XXXX -s "IT-CONS-PC4" -k trap -o "test"</p>
  
  <p>Error:</p>
  
  <p>zabbix_sender [8688]: DEBUG: send value error: ZBX_TCP_READ() timed out</p>
  
  <p>Did someone else had this issue?</p>