zabbix问题

mengchang_cu

zabbix监控时没有图像，在config-hosts里边看到主机已经处于监控状态，但是就是没有数据输出，zabbix_server和zabbix_agentd都已经起来了，在zabbix_server.log，里边看到如下报错信:
3370:20120229:141301.288 Deleted 0 records from history and trends
  3346:20120229:141708.941 Zabbix Host [mysql.nod2]: first network error, wait for 15 seconds
  3346:20120229:143143.868 Zabbix Host [mysql.nod2]: first network error, wait for 15 seconds
  3349:20120229:143337.230 Item [mysql.nod2:mysql.live] is not supported
  3349:20120229:144205.005 Zabbix Host [mysql.nod2]: another network error, wait for 15 seconds
  3347:20120229:144205.009 Zabbix Host [mysql.nod2]: first network error, wait for 15 seconds
  3347:20120229:145807.794 Zabbix Host [mysql.nod2]: another network error, wait for 15 seconds
  3346:20120229:145807.836 Zabbix Host [mysql.nod2]: first network error, wait for 15 seconds
  3344:20120229:145914.708 Zabbix Host [mysql.nod2]: another network error, wait for 15 seconds
  3349:20120229:145914.708 Zabbix Host [mysql.nod2]: first network error, wait for 15 seconds
就是不知道是什么原因引起的，有谁遇到了帮忙看下，联系方式：
qq:1091262364