Anne, please check your /etc/ntp.conf for the "server" statement; CentOS original is > server 0.rhel.pool.ntp.org > server 1.rhel.pool.ntp.org > server 2.rhel.pool.ntp.org These 2 server ips you listed do not belong to this pool (you can check via dns), and resolved backwardly their names do not sound like they are ntp servers. You should find out why your ntp tries to send to them (and what). The "total synchronizations ..." line at least seems to say that your ntp sync works - you could check that with ntpdate against a server from the above pool to be sure. Dirk --On 15. November 2008 09:54:19 +0000 Anne Wilson <cannewilson at googlemail.com> wrote: > My server is supposed to be using ntp, with nothing changed from the > defaults set up by CentOS5. However, daily I see log entries like > > Total synchronizations 2 (hosts: 2) > > **Unmatched Entries** > sendto(193.6.222.20) (fd=21): Invalid argument: 1 time(s) > sendto(141.89.226.2) (fd=21): Invalid argument: 1 time(s) > > Does this mean that ntp is failing? I assume so, and if so, how do I > change the sources to something that will work? > > Anne -------------------------------------------------------------- Dirk H. Schulz IT Systems Service Wiesenweg 12, 85567 Grafing Tel. 0 80 92/86 25 68 Fax. 0 80 92/86 25 72 -------------------------------------------------------------- Technik vom Feinsten - und das nötige Tuning