Local Domain intercepted with Proxy Autoconfiguration

[Guest]

[g.vecchi]

Hi all!
I'm running EFW 2.4.1 with Proxy and Content Filtering Enabled.
EFW not act as a Trasparent Proxy, so client autoconfigure themselves with proxy.pac from because EFW is not the gateway.
The problem is that after autoconfiguration all local traffic is intercepted by proxy.

Any ideas how to modify proxy.pac ?

Thanks