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.

give us more info to sort out this issue.

regards

sebastan