Hi I tried to used ntpd to sync time, but always got a failure error: [root@home]# /sbin/service ntpd restart Shutting down ntpd: [ OK ] ntpd: Synchronizing with time server: [FAILED] Starting ntpd: [ OK ] how to fix this? the conf file reads as # Permit time synchronization with our time source, but do not # permit the source to query or modify the service on this system. restrict default kod nomodify notrap nopeer noquery # Permit all access over the loopback interface. This could # be tightened as well, but to do so would effect some of # the administrative functions. restrict <a href="http://127.0.0.1">127.0.0.1</a> # Hosts on local network are less restricted. #restrict <a href="http://192.168.1.0">192.168.1.0</a> mask <a href="http://255.255.255.0">255.255.255.0</a> nomodify notrap # Use public servers from the <a href="http://pool.ntp.org">pool.ntp.org</a> project. # Please consider joining the pool (<a href="http://www.pool.ntp.org/join.html">http://www.pool.ntp.org/join.html</a>). server <a href="http://0.pool.ntp.org">0.pool.ntp.org</a> server <a href="http://1.pool.ntp.org">1.pool.ntp.org</a> server <a href="http://2.pool.ntp.org">2.pool.ntp.org</a> server <a href="http://asia.pool.ntp.org">asia.pool.ntp.org </a> server <a href="http://0.fedora.pool.ntp.org">0.fedora.pool.ntp.org</a> server <a href="http://1.fedora.pool.ntp.org">1.fedora.pool.ntp.org</a> server <a href="http://2.fedora.pool.ntp.org">2.fedora.pool.ntp.org </a> #broadcast <a href="http://192.168.1.255">192.168.1.255</a> key 42 # broadcast server #broadcastclient # broadcast client #broadcast <a href="http://224.0.1.1">224.0.1.1</a> key 42 # multicast server #multicastclient <a href="http://224.0.1.1">224.0.1.1</a> # multicast client #manycastserver <a href="http://239.255.254.254">239.255.254.254</a> # manycast server #manycastclient <a href="http://239.255.254.254">239.255.254.254</a> key 42 # manycast client # Undisciplined Local Clock. This is a fake driver intended for backup # and when no outside source of synchronized time is available. fudge <a href="http://127.127.1.0">127.127.1.0</a> stratum 10 # Drift file. Put this in a directory which the daemon can write to. # No symbolic links allowed, either, since the daemon updates the file # by creating a temporary in the same directory and then rename()'ing # it to the file. driftfile /var/lib/ntp/drift # Key file containing the keys and key identifiers used when operating # with symmetric key cryptography. keys /etc/ntp/keys # Specify the key identifiers which are trusted. #trustedkey 4 8 42 # Specify the key identifier to use with the ntpdc utility. #requestkey 8 # Specify the key identifier to use with the ntpq utility. #controlkey 8 server <a href="http://127.127.1.0">127.127.1.0</a> restrict <a href="http://0.pool.ntp.org">0.pool.ntp.org</a> mask <a href="http://255.255.255.255">255.255.255.255</a> nomodify notrap noquery restrict <a href="http://1.pool.ntp.org">1.pool.ntp.org</a> mask <a href="http://255.255.255.255">255.255.255.255</a> nomodify notrap noquery restrict <a href="http://2.pool.ntp.org">2.pool.ntp.org</a> mask <a href="http://255.255.255.255"> 255.255.255.255</a> nomodify notrap noquery restrict <a href="http://asia.pool.ntp.org">asia.pool.ntp.org</a> mask <a href="http://255.255.255.255">255.255.255.255</a> nomodify notrap noquery Thanks Yuandan