I have recently setup a Exchange 2013 environment which is co-existing with an Exchange 2010 environment. I have also setup a Kemp LoadMaster using the Exchange 2013 template but I am seeing some issues with OWA primarily, when I log into OWA which is pointing to the Exchange 2013 servers I can log in but the web page doesnt load correctly and after clicking around a litle bit I am returned to the OWA login prompt. My mailbox is still located on an Exchange 2010 mailbox server currently so its proxying across if that makes any difference.
I havent changed any settings after adding the virtual service using the template so not sure what could be wrong. My client computer, the exchange servers and the HLB are all on the same subnet if that is relevant.