I applied the template Server Clock Drift (powershell) and it's working on almost all of my servers. I'm getting the attached error message on one of them. Does anyone know what would cause this?
I applied the template Server Clock Drift (powershell) and it's working on almost all of my servers. I'm getting the attached error message on one of them. Does anyone know what would cause this?
We've done some investigation internally and believe the issue is that the default configured NTP server defined in the template is blocking your connection intermittently. If you have many servers configured with this template than it's possible you are exceeding their maximum rate of querying once every 4 seconds on occasion.
All users should ensure that their software NEVER queries a server more frequently than once every 4 seconds. Systems that exceed this rate will be refused service. In extreme cases, systems that exceed this limit may be considered as attempting a denial-of-service attack.
To resolve this issue I recommend changing the time server configured for some nodes to use pool.ntp.org instead.
Based on the message returned it appears that host is blocking connections. The good news is there's plenty of publicly accessible NTP servers. Below is a list of a few of them from http://tf.nist.gov/tf-cgi/servers.cgi
Name | IP Address | Location |
nist1-ny.ustiming.org | 64.90.182.55 | New York City, NY |
nist1-nj.ustiming.org | 96.47.67.105 | Bridgewater, NJ |
nist1-nj2.ustiming.org | 165.193.126.229 | Weehawken, NJ |
nist1-ny2.ustiming.org | 216.171.112.36 | New York City, NY |
nist1-pa.ustiming.org | 206.246.122.250 | Hatfield, PA |
time-a.nist.gov | 129.6.15.28 | NIST, Gaithersburg, Maryland |
time-b.nist.gov | 129.6.15.29 | NIST, Gaithersburg, Maryland |
time-c.nist.gov | 129.6.15.30 | NIST, Gaithersburg, Maryland |
time-d.nist.gov | 2610:20:6F15:15::27 | NIST, Gaithersburg, Maryland |
nist1.aol-va.symmetricom.com | 64.236.96.53 | Reston, Virginia |
nist1-macon.macon.ga.us | 98.175.203.200 | Macon, Georgia |
nist1-atl.ustiming.org | 64.250.177.145 | Atlanta, Georgia |
wolfnisttime.com | 207.223.123.18 | Birmingham, Alabama |
nist1-chi.ustiming.org | 216.171.120.36 | Chicago, Illinois |
nist.time.nosc.us | 96.226.242.9 | Carrollton, Texas |
nist.expertsmi.com | 162.17.148.102 | Monroe, Michigan |
nist.netservicesgroup.com | 64.113.32.5 | Southfield, Michigan |
nisttime.carsoncity.k12.mi.us | 66.219.116.140 | Carson City, Michigan |
nist1-lnk.binary.net | 216.229.0.179 | Lincoln, Nebraska |
wwv.nist.gov | 24.56.178.140 | WWV, Fort Collins, Colorado |
time-nist.symmetricom.com | 12.10.191.251 | Symmetricom, Boulder, Colorado |
time-a.timefreq.bldrdoc.gov | 132.163.4.101 | NIST, Boulder, Colorado |
time-b.timefreq.bldrdoc.gov | 132.163.4.102 | NIST, Boulder, Colorado |
time-c.timefreq.bldrdoc.gov | 132.163.4.103 | NIST, Boulder, Colorado |
time.nist.gov | global address for all servers | Multiple locations |
utcnist.colorado.edu | 128.138.140.44 | University of Colorado, Boulder |
utcnist2.colorado.edu | 128.138.141.172 | University of Colorado, Boulder |
ntp-nist.ldsbc.edu | 198.60.73.8 | LDSBC, Salt Lake City, Utah |
nist1-lv.ustiming.org | 64.250.229.100 | Las Vegas, Nevada |
time-nw.nist.gov | 131.107.13.100 | Microsoft, Redmond, Washington |
nist-time-server.eoni.com | 216.228.192.69 | La Grande, Oregon |
nist1.symmetricom.com | 69.25.96.13 | San Jose, California |
nist1-sj.ustiming.org | 216.171.124.36 | San Jose, California |
nist1-la.ustiming.org | 64.147.116.229 | Los Angeles, California |
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