[root@monit zabbix]# cat zabbix_server.log | grep -i nas.oakalleyit.com
 14149:20140801:045117.036 Zabbix agent item [vfs.fs.size[/,pused]] on host [nas.oakalleyit.com] failed: first network error, wait for 15 seconds
 14150:20140801:045132.991 resuming Zabbix agent checks on host [nas.oakalleyit.com]: connection restored
 14146:20140801:045210.423 Zabbix agent item [vfs.fs.size[/var,pfree]] on host [nas.oakalleyit.com] failed: first network error, wait for 15 seconds
 14150:20140801:045225.070 resuming Zabbix agent checks on host [nas.oakalleyit.com]: connection restored
 14144:20140801:132300.022 Zabbix agent item [vfs.fs.size[/home,free]] on host [nas.oakalleyit.com] failed: first network error, wait for 15 seconds
 14150:20140801:132314.858 resuming Zabbix agent checks on host [nas.oakalleyit.com]: connection restored
 14147:20140801:132358.110 Zabbix agent item [vfs.fs.size[/tmp,pfree]] on host [nas.oakalleyit.com] failed: first network error, wait for 15 seconds
 14150:20140801:132413.936 resuming Zabbix agent checks on host [nas.oakalleyit.com]: connection restored
 14144:20140801:231959.044 Zabbix agent item [vfs.fs.size[/,used]] on host [nas.oakalleyit.com] failed: first network error, wait for 15 seconds
 14150:20140801:232014.798 resuming Zabbix agent checks on host [nas.oakalleyit.com]: connection restored
 14144:20140802:040046.864 Zabbix agent item [vfs.fs.inode[/opt,pfree]] on host [nas.oakalleyit.com] failed: first network error, wait for 15 seconds
 14150:20140802:040101.194 resuming Zabbix agent checks on host [nas.oakalleyit.com]: connection restored
 14147:20140803:151500.014 Zabbix agent item [swap.used] on host [nas.oakalleyit.com] failed: first network error, wait for 15 seconds
 14150:20140803:151514.986 resuming Zabbix agent checks on host [nas.oakalleyit.com]: connection restored
 14146:20140807:040620.049 Zabbix agent item [vfs.fs.size[/var,pfree]] on host [nas.oakalleyit.com] failed: first network error, wait for 15 seconds
 14150:20140807:040635.278 resuming Zabbix agent checks on host [nas.oakalleyit.com]: connection restored
  1788:20140810:164031.207 Zabbix agent item [net.if.in[lo,bytes]] on host [nas.oakalleyit.com] failed: first network error, wait for 15 seconds
  1793:20140810:164031.894 Zabbix agent item [system.cpu.load[,avg1]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  1792:20140810:164032.108 Zabbix agent item [proc.num[]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  1787:20140810:164032.870 Zabbix agent item [net.if.in[eth0,bytes]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  1789:20140810:164034.900 Zabbix agent item [net.if.out[eth0,bytes]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  1794:20140810:164049.868 Zabbix agent item [system.cpu.load[,avg1]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  1794:20140810:164105.107 Zabbix agent item [vfs.fs.inode[/home,free]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  1794:20140810:164120.252 temporarily disabling Zabbix agent checks on host [nas.oakalleyit.com]: host unavailable
  1794:20140810:165314.879 enabling Zabbix agent checks on host [nas.oakalleyit.com]: host became available
  1789:20140810:170037.492 Zabbix agent item [net.if.out[eth0,bytes]] on host [nas.oakalleyit.com] failed: first network error, wait for 15 seconds
  1794:20140810:170051.400 resuming Zabbix agent checks on host [nas.oakalleyit.com]: connection restored
  1788:20140810:175938.552 Zabbix agent item [proc.num[mysqld]] on host [nas.oakalleyit.com] failed: first network error, wait for 15 seconds
  1794:20140810:175953.074 resuming Zabbix agent checks on host [nas.oakalleyit.com]: connection restored
  1787:20140810:232554.020 Zabbix agent item [agent.ping] on host [nas.oakalleyit.com] failed: first network error, wait for 15 seconds
  1792:20140810:232633.492 Zabbix agent item [vfs.fs.inode[/home,free]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  1794:20140810:232647.883 temporarily disabling Zabbix agent checks on host [nas.oakalleyit.com]: host unavailable
  1794:20140810:232747.579 enabling Zabbix agent checks on host [nas.oakalleyit.com]: host became available
  5792:20140812:151622.028 Zabbix agent item [vfs.fs.size[/var,used]] on host [nas.oakalleyit.com] failed: first network error, wait for 15 seconds
  5793:20140812:151636.273 resuming Zabbix agent checks on host [nas.oakalleyit.com]: connection restored
  5791:20140813:101312.576 Zabbix agent item [vfs.fs.inode[/usr,pfree]] on host [nas.oakalleyit.com] failed: first network error, wait for 15 seconds
  5789:20140813:101314.076 Zabbix agent item [net.if.out[lo,bytes]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  5788:20140813:101315.057 Zabbix agent item [vm.memory.size[free]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  5792:20140813:101316.075 Zabbix agent item [net.tcp.service[http]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  5790:20140813:101317.102 Zabbix agent item [system.cpu.load[,avg15]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  5793:20140813:101332.991 resuming Zabbix agent checks on host [nas.oakalleyit.com]: connection restored
  1933:20140815:234117.824 Zabbix agent item [proc.num[httpd]] on host [nas.oakalleyit.com] failed: first network error, wait for 15 seconds
  1936:20140815:234132.152 resuming Zabbix agent checks on host [nas.oakalleyit.com]: connection restored
  1933:20140816:035917.121 Zabbix agent item [vfs.fs.inode[/opt,pfree]] on host [nas.oakalleyit.com] failed: first network error, wait for 15 seconds
  1936:20140816:035931.585 resuming Zabbix agent checks on host [nas.oakalleyit.com]: connection restored
  1931:20140816:182908.679 Zabbix agent item [proc.num[sshd]] on host [nas.oakalleyit.com] failed: first network error, wait for 15 seconds
  1936:20140816:182922.063 resuming Zabbix agent checks on host [nas.oakalleyit.com]: connection restored
  1933:20140818:042145.670 Zabbix agent item [vfs.fs.inode[/opt,free]] on host [nas.oakalleyit.com] failed: first network error, wait for 15 seconds
  1936:20140818:042200.733 resuming Zabbix agent checks on host [nas.oakalleyit.com]: connection restored
  1701:20140818:203620.094 Zabbix agent item [system.cpu.util[,idle,avg1]] on host [nas.oakalleyit.com] failed: first network error, wait for 15 seconds
  1699:20140818:203620.205 Zabbix agent item [net.if.out[eth0,bytes]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  1704:20140818:203635.022 Zabbix agent item [mounted[/home]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  1704:20140818:203650.226 Zabbix agent item [system.swap.size[,pfree]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  1704:20140818:203705.751 temporarily disabling Zabbix agent checks on host [nas.oakalleyit.com]: host unavailable
  1843:20140818:225528.356 enabling Zabbix agent checks on host [nas.oakalleyit.com]: host became available
  1839:20140818:225706.909 Zabbix agent item [vfs.fs.inode[/opt,pfree]] on host [nas.oakalleyit.com] failed: first network error, wait for 15 seconds
  1840:20140818:225708.744 Zabbix agent item [vfs.fs.size[/usr,used]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  1841:20140818:225710.169 Zabbix agent item [vfs.fs.inode[/tmp,free]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  1842:20140818:225710.231 Zabbix agent item [vfs.fs.size[/var,pfree]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  1838:20140818:225727.768 Zabbix agent item [vfs.fs.size[/home,used]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  1843:20140818:225746.416 Zabbix agent item [system.cpu.load[,avg1]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  1843:20140818:225801.670 temporarily disabling Zabbix agent checks on host [nas.oakalleyit.com]: host unavailable
  1843:20140818:225900.913 enabling Zabbix agent checks on host [nas.oakalleyit.com]: host became available
  1797:20140819:142858.998 Zabbix agent item [net.if.in[eth0,bytes]] on host [nas.oakalleyit.com] failed: first network error, wait for 15 seconds
  1796:20140819:142900.152 Zabbix agent item [vfs.fs.size[/,free]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  1794:20140819:142901.242 Zabbix agent item [system.localtime] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  1795:20140819:142902.044 Zabbix agent item [system.swap.size[,free]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  1798:20140819:142903.179 Zabbix agent item [system.swap.size[,pfree]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  1799:20140819:142918.094 resuming Zabbix agent checks on host [nas.oakalleyit.com]: connection restored
  1794:20140819:143348.350 Zabbix agent item [net.tcp.service[ssh]] on host [nas.oakalleyit.com] failed: first network error, wait for 15 seconds
  1798:20140819:143349.080 Zabbix agent item [vfs.fs.inode[/usr,free]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  1795:20140819:143349.936 Zabbix agent item [vfs.fs.size[/opt,used]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  1797:20140819:143350.299 Zabbix agent item [net.if.in[eth0,bytes]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  1796:20140819:143405.213 Zabbix agent item [vfs.fs.size[/opt,free]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  1799:20140819:143406.106 Zabbix agent item [vfs.fs.inode[/opt,free]] on host [nas.oakalleyit.com] failed: another network error, wait for 15 seconds
  1799:20140819:143421.530 resuming Zabbix agent checks on host [nas.oakalleyit.com]: connection restored
  1795:20140819:185526.367 Zabbix agent item [vfs.fs.inode[/usr,pfree]] on host [nas.oakalleyit.com] failed: first network error, wait for 15 seconds
  1799:20140819:185541.224 resuming Zabbix agent checks on host [nas.oakalleyit.com]: connection restored
  1795:20140819:233439.074 Zabbix agent item [vm.memory.size[cached]] on host [nas.oakalleyit.com] failed: first network error, wait for 15 seconds
  1799:20140819:233455.050 resuming Zabbix agent checks on host [nas.oakalleyit.com]: connection restored
  1795:20140820:031858.579 Zabbix agent item [net.if.in[lo,bytes]] on host [nas.oakalleyit.com] failed: first network error, wait for 15 seconds
  1799:20140820:031915.747 resuming Zabbix agent checks on host [nas.oakalleyit.com]: connection restored
  1796:20140820:043504.124 Zabbix agent item [proc.num[inetd]] on host [nas.oakalleyit.com] failed: first network error, wait for 15 seconds
  1799:20140820:043519.907 resuming Zabbix agent checks on host [nas.oakalleyit.com]: connection restored