I like the mod_proxy solution better than pcgi or fast_cgi, but I need to authenticate users with X.509 certificates. Mod_ssl will allow Apache to pass through the certificate information to zope using zope.cgi (I believe this works, but I have not tested it yet). "SSLOption ExportCertData" will create environment variables for use by cgi/ssi scripts. Does anyone know if mod_proxy will also pass these environment variables to zope? Thanks, Clarence T. Pate