Application asking always authorization for income network

Delete the preference:
/Library/Preferences/com.apple.alf.plist

And restart

Slow Yosemite: check Firevault

I had a problem of very slow computer under Yosemite. In control panel, Security and confidentiality, Firevault was activated but cryptation was in pause for unknown reason.

The solution has been to start in the recovery session (Cmd + R until the apple appears), then choose disk utilities and repair volume and permission after authentificate yourself because disk was crypted.

After a normal startup, Firevault cryptation finished and I could stop it.