Inbound Load Balancing https with sticky connection

[zeux]

Hi to everybody,

first of all I'm very sorry for my English…

This is my scenario:

Internet
                                                                  |
                                                                  |
            pfsense_1Firewall+LB + pfsense_2Firewall+LB
                                                                  |
                                                                  |
nginx_1(PHP5 HTTP+HTTPS) +  nginx_2(PHP5 HPPT+HTTPS) + nginx_3(PHP5 HTTP+HTTPS)

Pfsense 1 and 2 CARP configured with virtual IP (pubblic). Nginx servers's ips are all private.

I want to load balance inbound HTTP and HTTPS connections between the 3 nginx web servers. An importat thing is that the HTTPS connections must be "sticky connections": in HTTPS connections, after login by username and password, I setup a php session and therefore when a client starts a HTTPS connection it will be always redirected to the same nginx server, until it disconnects itself, it closes the page/browser or after a timeout (30minutes?) without activity.
Is this possible whit the last release of pfsense?

thank you very much…

[zeux]

Help me, please….