trouble wth Loadbalance HTTP Traffic

Dear All,

 

I have trouble with loadbalance HTTP Traffic.

 

Below is the Deployment Scenario :

 

I have BIGIP that only have Link Controller License. We deploy inbound and outbound load balance for Mail Exchange Client Access Server (CAS) or can be called as OWA. we also have 2 unit CAS and using loadbalance least connection. At the DNS server, Access to OWA is using Virtual IP that create at Virtual Server.

 

There is no Problem when few user login to the OWA and enable 2 node/member at the Pool.

 

When the user is about 300 connection (total from 2 Server) and enable 2 node/member at Pool, user is experience below trouble :

 

- some user must enter username&password for several times to successfully login to the OWA.

 

- some user successfully login but can not logout.

 

- some user successfully login but the interface is broken (no image in the web interface).

 

- some user successfully login and has no problem.

 

 

If the Pool is enable only 1 node/member there is no problem at all.

 

I also want to ask, if i only have LC license, can i use iApps? The Web Gui have iApps menu, but there is error when i finished and apply the configuration at the iApps menu. I think, its because the iApps only can be use when the LTM license is purchased. Am i correct?

 

Please advice and help for our problem.

 

Thank you.