[NS] Task Server Installed / Inactive. What happened?

Two days ago, Symantec Managemet Platform was working great. Deploy agents, sending task, collect inventory, everything was ok.

Yesterday, I tried to send a new task, i found out tasks don't start. Have a look:

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The status stays as "not started" for a while and doesn't change! That's weird.

Then, I went to configuration settings of NS, and found out this: 

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The Task Service is "installed, inactive". I dont know what happened, since this was working fine a day ago.

Any ideas about the problem? Corrupted service, user authentication failure, anything?

PS: I'm looking for a way to active this task service, but i havent found anything yet.

Thanks in advance