I am running CentOS 6.4 64bit with the default latest kernel from Linode. Every day I get this message in Logwatch:

 --------------------- XNTPD Begin ------------------------ 
 **Unmatched Entries**
   sendto(2a01:4f8:160:542e::2) (fd=20): Operation not permitted: 85 time(s)
 ---------------------- XNTPD End ------------------------- 

On my other dedicated servers, I never has this message in the logs. Only in my Linode VPS. I have setup ntp like this:

rm /etc/localtime
ln -s /usr/share/zoneinfo/Europe/Oslo /etc/localtime
/etc/init.d/ntpd stop
chkconfig ntpd on
ntpdate pool.ntp.org
/etc/init.d/ntpd start

Does anybody know what is wrong that give the XNTPD "Operation not permitted" message?

Check this: http://serverfault.com/questions/380561 ... centos-6-2 (file /etc/sysconfig/clock then run tzdata-update)

And test your linode's ipv6 connectivity.

Cheers.