SSO functionality for Revese Proxy

Steve is absolutely correct. This is a primary function of the Access Policy Manager (APM) module. Also understand that under most conditions, the BIG-IP platform IS already a reverse proxy. So APM can collect user credentials and then use those credentials to transparently authenticate the user to different applications behind the reverse proxy. Moreover, the type of SSO can be different for each application (ie NTLM, Kerberos, form, Basic, etc.) and you can even authenticate across federated platforms with SAML.