Local 3505 udp

Hello, I've noticed that one of my servers has enabled strange process - local,udp. Sometimes it works sometimes don't, always listen on different high ports. I started only ssh, pop3, imaps, smtp and spamassasin. What is this? -- ++++++++++++++++++++++++++++++++++++++++++ Dominik Skladanowski ++++++++++++++++++++++++++++++++++++++++++