Sorry for the misunderstanding, I went to the etc/ folder and didn't find dansguardian, so, like i'm not familiarized with Zentyal, I supposed that it wasn't installed, but after a while I found it.
I'm not used to it, i'm just trying to get better with your help
Continuing, I saw the conf of desguardian, and noticed that the proxy was wrong, I set my to 192.168.0.253 and it was 127.0.0.1, can it be that?
I'll wait until tomorrow to check if it works.
Thanks guys