Ok, I think I did something stupid, could somebody confirm this:

In the firewall module I disabled the "system policy for outgoing traffic" but I havnt defined before any outgoing policy before. Does that means that I blocked ALL outgoing trafic from my server? just after that I was unable to connect to any service (mail, http, ssh, plesk...)

The only solution to resolve that is to directly in the server allow the outgoing traffic again?