hi u cannot redirect http traffic for a proxy server but u can surely redirect them for a url-filtering server. by the way if u are using the proxy for authentication of clients for http sites. u can configure that also on the pix.
if u want the users should have access the proxy first before accessing a website u will have to place the proxy server before the pix. this will dpend how many interfaces u are using in the proxy server.
We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...