Adding an external Proxy server

[bakerboy1977]

I have a PFsense already running. I now have an external Blue Coat proxy server. Is it possible to configure the PFsense so that every user will be directed through the proxy server?

[heper]

you could try following post, i've not attempted it myself

http://forum.pfsense.org/index.php?topic=46506.0

[thermo]

run squid in transparent mode on the pfsense firewall and configure squid to use the bl 
uecoat proxy as a parent cache. some additional squid config is required.

[dhatz]

Sure, if it's configured to run in transparent mode, you can forward the necessary port(s) to it (as marcelloc suggests in the link that heper gave).