iApp for Exchange CAS Load balance Method Doesn't Works for OWA Pool

Hi Mike,

Sorry for the late update the status. The TMG is just act as reverse proxy. I didn't modify the iRule but I have changed the value of Fallback Persistence from "Source Address Affinity" to "None" and the load-balancing is working now. Is it the Fallback Persistence caused the issue? The list ltm virtual for https combined as below.

ltm virtual /Common/exchange_2010.app/exchange_2010_combined_https { app-service /Common/exchange_2010.app/exchange_2010 destination /Common/192.168.x.x:443 ip-protocol tcp mask 255.255.255.255 persist { /Common/exchange_2010.app/exchange_2010_cookie_persistence_profile { default yes } } profiles { /Common/custom_analytics { } /Common/exchange_2010.app/exchange_2010_caching_profile { } /Common/exchange_2010.app/exchange_2010_http_profile { } /Common/exchange_2010.app/exchange_2010_lan-optimized_tcp_profile { } /Common/exchange_2010.app/exchange_2010_oneconnect { } /Common/exchange_2012_clientssl { context clientside } /Common/exchange_2012_serverssl { context serverside } /Common/ntlm { } } rules { /Common/exchange_2010.app/exchange_2010_owa_redirect_irule7 /Common/exchange_2010.app/exchange_2010_snatpool_irule7 /Common/exchange_2010.app/exchange_2010_combined_persist_irule7 } source 0.0.0.0/0 source-address-translation { pool /Common/exchange_2010.app/exchange_2010_snatpool type snat } translate-address enabled translate-port enabled }