UNIX for Dummies Questions & Answers

Hi everybody. I'm not sure where to post this, so I hope here is OK. I have 4 name servers and on one of the slaves, my log files are filling up with this error:

ntpd[2696]: sendto([internal ip adress]) (fd=20): Invalid argument

It is always the same IP, and only on this name server. A quick google revealed that the error can sometimes happen if the connection goes down and comes back up. Ntpd will still think the connection is down and error out forever. I saw a post somewhere else saying that someone fixed it by having a cron job run every hour that restarts ntpd. What do you all think? Any more information on what this error means? What would you all recommend me to do?

These are very important servers and I want to find out the best course of action before making any changes. I need this to stop having whatever problem it's having and stop spitting this error into the logfiles every 3 seconds. All help would be greatly appreciated.

Here is a shot in the dark... could you have two or instances of ntpd running at the same time?