Hi all! I've just set this zentyal-2.2 (old version, updated as in 20130919) Set proxy as NOT TRANSPARENT (as in "NOT TRANSPARENT"); Zentyal proxy works as espected bloking http, https (note the S in httpS..as in 443) gets blocked (as espected) but just send a typical "Not found page".
Any one knows how to force squid/dansguardian to render/deploy (when blocked/denyed) the same page it does for plain http for https?