eventdns: all nameservers have failed

[Praedor Atrebates]

I get this message now in my tor log.  No other useful info provided.

What is the cause?  I have been cleaning up my system daemons (Mandriva linux) 
and terminated a few services that I didn't believe I needed.  

What are the services/ports required for tor to operate properly?  What 
service being shut down might cause this message?

praedor
-- 
"If we have Senators and Congressmen there that can't protect themselves 
against the evil temptations of lobbyists, we don't need to change our 
lobbies, we need to change our representatives." - Will Rogers