vpnc disconnecting frequently?

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http://www.linuxquestions.org – I have vpnc working in my RHEL 5.1 tikanga but there is frequent disconnecivity.I explore and googled and got the link: http://linux.derkeiler.com/Mailing-L.../msg02624.html It suggest to add a line in vpnc.config: Code: Try adding DPD idle timeout (our side) 0 to /etc/vpnc/<connection config>. What is the correct entry to be made? Is it : Code: DPD idle timeout 0 I tried editing this line but it shows syntax error? (HowTos)