When you configure the session broker IP address on the first page of the iChain Web Server Accelerator, the change is only recognized by the proxy server if one (or both) of two requirements are met:
A subsequent page of the wizard is accessed before clicking Finish,
or
Apply is either clicked from the iChain Proxy Administration Tool or entered from the iChain console.
Until at least one of these requirements is met, the iChain Proxy server does not communicate with the session broker.
Setting basic authentication for LDAP and turning secure exchange off causes SB to fail and prompt for the user to log in on both servers.