False Redirection of Applications

There are 3 Applications a) abc.office.gov.com b) efg.office.gov.com c) office.gov.com.

All these three applications reside on two servers ( 192.168.30.30 & 192.168.30.10).

I have created one virtual server and 3 pools for each application. Also assigned the custom monitor to each pool.Round robin is used for load balancing.

I have also created an irule to redirect the request based on host to a respective pool.

Issue: When office.gov.com is down on either of the one server, it is redirecting on rest of the two applications instead of getting up from the another server.