l2tp vpn is disconnected after few minutes

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http://serverfault.com – I installed IPSec/L2TP on my vps server. I tried to connect from my mac to this VPN server. First time, connection is succeeded. But after a few minutes, connection was broken by itself. After this, I tried to connection again and connection was failed. pppd[7407]: pppd 2.4.2 (Apple version 727.1.15) started by albert, uid 501 pppd[7407]: L2TP connecting to server '' ( pppd[7407]: IPSec connection started racoon[7408]: plogsetfile: about to add racoon log file: /var/log/racoon.log racoon[7408]: accepted connection on vpn control socket. racoon[7408]: Connect (HowTos)