nanny exits when realserver down.

Issue

nanny exits when realserver down. This is the log from LVS router.

Sep 19 13:09:20 LZCA lvs[2583]: create_monitor for lvs/rs2 running as pid 2593
Sep 19 13:09:20 LZCA nanny[2593]: [ active ] making 172.16.198.54:443 available
Sep 19 13:09:25 LZCA pulse[2585]: gratuitous lvs arps finished
Sep 24 19:06:26 LZCA nanny[27746]: [inactive] shutting down 172.16.198.53:443 due to connection failure
Sep 24 19:06:26 LZCA nanny[26033]: [inactive] shutting down 172.16.198.53:443 due to connection failure
Sep 24 19:06:26 LZCA nanny[26033]: /sbin/ipvsadm command failed!
Sep 24 19:06:38 LZCA nanny[27746]: [ active ] making 172.16.198.53:443 available
Sep 24 19:09:07 LZCA nanny[24933]: [inactive] shutting down 172.16.198.54:443 due to connection failure
Sep 24 19:09:18 LZCA nanny[2593]: [inactive] shutting down 172.16.198.54:443 due to connection failure
Sep 24 19:09:18 LZCA nanny[2593]: /sbin/ipvsadm command failed!
Sep 24 19:09:18 LZCA lvs[2583]: nanny died! shutting down lvs
Sep 24 19:09:18 LZCA lvs[2583]: shutting down virtual service lvs