Description of Problem: The lastest ntp-4.0.99k-15 running on RH7.0 does not synchronize to their peers. Sometime syslog shows error message that might or might not be related: ntpd[16481]: select(7, ###----, 0L, 0L, &0.000000) error: Interrupted system call ntpdc has similar problem of getting peer information, it complains about: *** Server reports data not found How Reproducible: Problem shows up only on RH7.0, but not on RH6.2 which is running xntp3-5.93-15. It is reproducible all on kernel 2.2.17-14 and 2.2.19-7.0. It is also reproducible on the Linux/Alpha nodes. Steps to Reproduce: 1. Any RH7.0 setup 2. update ntp-4.0.99k-15 as suggested from RH security advisories, 2001-04-08. 3. quick check with ntpdc->sysinfo. Actual Results: ntpdc> sysinfo system peer: 0.0.0.0 system peer mode: unspec leap indicator: 11 stratum: 16 precision: -17 root distance: 0.00000 s root dispersion: 41.41754 s reference ID: [0.0.0.0] reference time: 00000000.00000000 Thu, Feb 7 2036 1:28:16.000 system flags: bclient auth monitor ntp kernel stats kernel_sync jitter: 0.000000 s stability: 0.000 ppm broadcastdelay: 0.003998 s authdelay: 0.000000 s Expected Results: Non-zero values from entries: system peer: root distance: reference ID: reference time: stability: authdelay: etc. Additional Information:
try to remove multicastclient from /etc/ntp.conf
We didn't use the keyword "multicastclient" in our ntp.conf. But we did remove the line with: broadcastclient yes and replaced the lines for the time servers: restrict <ip-of-server1> restrict <ip-of-server2> restrict <ip-of-server3> with: server <ip-of-server1> server <ip-of-server2> server <ip-of-server3> And all seem to work okay now.