# Server operators **URL:** https://community.ntppool.org/c/server-operators/6.md [Latest](https://community.ntppool.org/latest.md) · [Categories](https://community.ntppool.org/categories.md) · [Tags](https://community.ntppool.org/tags.md) --- ## [About the Server operators category](https://community.ntppool.org/t/about-the-server-operators-category/26)
**Author:** [@ask](https://community.ntppool.org/u/ask)\ **Replies:** 0
This section is about joining and running NTP servers in the pool system. Questions, suggestions, advice ... :slight\_smile: --- ## [The pool can always use more servers, but how many is too many in one location?](https://community.ntppool.org/t/the-pool-can-always-use-more-servers-but-how-many-is-too-many-in-one-location/4698)
**Author:** [@insignia96](https://community.ntppool.org/u/insignia96)\ **Replies:** 22\ **Last updated:** [September 26, 2026, 4:13pm UTC](https://community.ntppool.org/t/the-pool-can-always-use-more-servers-but-how-many-is-too-many-in-one-location/4698 "2026-09-26T16:13:43Z")
Hello all! Just wanted to say that I had a lot of fun setting up this project and tuning my server deployment and dashboards. Time servers really do produce some fun Grafana data to look at. I know it’s said that the p… --- ## [Rate-limiting / banning traffic to server](https://community.ntppool.org/t/rate-limiting-banning-traffic-to-server/4755)
**Author:** [@magnemann](https://community.ntppool.org/u/magnemann)\ **Replies:** 3\ **Last updated:** [September 26, 2026, 1:29pm UTC](https://community.ntppool.org/t/rate-limiting-banning-traffic-to-server/4755 "2026-09-26T13:29:11Z")
Hi, can someone help me find info on rate-limiting/banning traffic to my server? What is considered polite behavior for an NTP client (packets per second, burst)? thanks :grinning\_face: https://s1.mymilo.top Currently … --- ## [Tips/tricks for a new NTP server operator?](https://community.ntppool.org/t/tips-tricks-for-a-new-ntp-server-operator/4708)
**Author:** [@llarsen](https://community.ntppool.org/u/llarsen)\ **Replies:** 9\ **Last updated:** [September 21, 2026, 12:54pm UTC](https://community.ntppool.org/t/tips-tricks-for-a-new-ntp-server-operator/4708 "2026-09-21T12:54:20Z")
I’ve entered the world of NTP servers and recently spun up a server in Hong Kong which has just been added to the pool. I’m planning on starting low and slowly incrementing the Net speed as I don’t know if the CPU can ha… --- ## [Issues with China regional servers](https://community.ntppool.org/t/issues-with-china-regional-servers/4726)
**Author:** [@tsnbaka](https://community.ntppool.org/u/tsnbaka)\ **Replies:** 8\ **Last updated:** [September 20, 2026, 8:35am UTC](https://community.ntppool.org/t/issues-with-china-regional-servers/4726 "2026-09-20T08:35:06Z")
Since I am not proficient in English, the machine-translated text might sound awkward. Servers deployed in China are intended to serve devices within the Chinese mainland. Local telemetry indicates a latency of only abo… --- ## [PSA: NIST ntp-b.nist.gov Authenticated NTP Server Status](https://community.ntppool.org/t/psa-nist-ntp-b-nist-gov-authenticated-ntp-server-status/4730)
**Author:** [@elvisimprsntr](https://community.ntppool.org/u/elvisimprsntr)\ **Replies:** 4\ **Last updated:** [September 20, 2026, 8:13am UTC](https://community.ntppool.org/t/psa-nist-ntp-b-nist-gov-authenticated-ntp-server-status/4730 "2026-09-20T08:13:04Z")
Looks like ntp-b.nist.gov authenticated ntp server went off line at approximately 06:09 UTC on 2026-09-19 In fact, it appears all servers at Boulder, Colorado site might be offline, even though the status page lists the… --- ## [Centerclick NTP-220 finally arrived and in use](https://community.ntppool.org/t/centerclick-ntp-220-finally-arrived-and-in-use/4595)
**Author:** [@Bas](https://community.ntppool.org/u/Bas)\ **Replies:** 22\ **Last updated:** [September 19, 2026, 5:13pm UTC](https://community.ntppool.org/t/centerclick-ntp-220-finally-arrived-and-in-use/4595 "2026-09-19T17:13:36Z")
Hi all, The Centerclick NTP-220 finally arrived after in the mail for 20 days, not they’re fault as I requested normal postage service because of poor delivery by private companies (they often don’t deliver at all!) Th… --- ## [Meinberg GPS optical link](https://community.ntppool.org/t/meinberg-gps-optical-link/4555)
**Author:** [@Maurice](https://community.ntppool.org/u/Maurice)\ **Replies:** 5\ **Last updated:** [September 18, 2026, 7:52pm UTC](https://community.ntppool.org/t/meinberg-gps-optical-link/4555 "2026-09-18T19:52:35Z")
I recently bought a used Meinberg M300 that included an optical link system (GOAL). It seems brand new, but I don’t have a need for it. I don’t have a fiber optic cable with the right connectors, so I can’t test it, but… --- ## [Issue with server-owner-help@ntppool.org](https://community.ntppool.org/t/issue-with-server-owner-help-ntppool-org/4703)
**Author:** [@jamie](https://community.ntppool.org/u/jamie)\ **Replies:** 1\ **Last updated:** [September 11, 2026, 10:34pm UTC](https://community.ntppool.org/t/issue-with-server-owner-help-ntppool-org/4703 "2026-09-11T22:34:20Z")
I couldn’t find an email address to contact on the website, so I’m posting here. When trying to send email to server-owner-help@ntppool.org the mail server rejects it with: This is an automated message from the mail sy… --- ## [503 Service Unavailable errors](https://community.ntppool.org/t/503-service-unavailable-errors/4701)
**Author:** [@avij](https://community.ntppool.org/u/avij)\ **Replies:** 2\ **Last updated:** [September 11, 2026, 10:33pm UTC](https://community.ntppool.org/t/503-service-unavailable-errors/4701 "2026-09-11T22:33:01Z")
Hello @ask, I’m currently getting “503 Service Unavailable” errors from ntppool.org and manage.ntppool.org. ntppool-agent also complains about various connectivity problems. --- ## [109.74.206.120 – stale reference timestamp / high root dispersion](https://community.ntppool.org/t/109-74-206-120-stale-reference-timestamp-high-root-dispersion/4677)
**Author:** [@MartinJohnaqluk](https://community.ntppool.org/u/MartinJohnaqluk)\ **Replies:** 13\ **Last updated:** [September 10, 2026, 6:17pm UTC](https://community.ntppool.org/t/109-74-206-120-stale-reference-timestamp-high-root-dispersion/4677 "2026-09-10T18:17:22Z")
I’m seeing what appears to be a synchronisation issue with NTP server 109.74.206.120. The server responds normally to NTP requests and advertises itself as Stratum 2, with LI=0, but its reference timestamp appears to be… --- ## [My server is being included in what seems to be bungled internal Tesla vulnerability scanning](https://community.ntppool.org/t/my-server-is-being-included-in-what-seems-to-be-bungled-internal-tesla-vulnerability-scanning/4672)
**Author:** [@robinpie](https://community.ntppool.org/u/robinpie)\ **Replies:** 16\ **Last updated:** [September 10, 2026, 4:07pm UTC](https://community.ntppool.org/t/my-server-is-being-included-in-what-seems-to-be-bungled-internal-tesla-vulnerability-scanning/4672 "2026-09-10T16:07:47Z")
Over roughly the past two days, my HTTP server (that happens to be on the same IP as my NTP server) has received ~8,000 requests from 54.165.75.96 and 35.168.63.24, UA Assetnote/1.0.0 (ExposureScan), with many templated … --- ## [Applying for a vendor zone](https://community.ntppool.org/t/applying-for-a-vendor-zone/1424)
**Author:** [@Freesat](https://community.ntppool.org/u/Freesat)\ **Replies:** 7\ **Last updated:** [September 9, 2026, 5:28pm UTC](https://community.ntppool.org/t/applying-for-a-vendor-zone/1424 "2026-09-09T17:28:23Z")
Hi, I have applied for a vendor zone 3 months ago following the normal method. At the moment the application is still at pending. I have followed this up an email or two to chase but as of yet unfortunately little progr… --- ## [NTP Reflection Attack](https://community.ntppool.org/t/ntp-reflection-attack/4598)
**Author:** [@koehn](https://community.ntppool.org/u/koehn)\ **Replies:** 8\ **Last updated:** [September 9, 2026, 5:27pm UTC](https://community.ntppool.org/t/ntp-reflection-attack/4598 "2026-09-09T17:27:29Z")
One of my nodes had a block installed by the ISP (RackNerd) for allegedly being used in an NTP reflection attack. I’ve had to disable it for now; is this something that happens often? I saw another reference in this foru… --- ## [Queries after removing a server from the pool](https://community.ntppool.org/t/queries-after-removing-a-server-from-the-pool/66)
**Author:** [@josephb](https://community.ntppool.org/u/josephb)\ **Replies:** 7\ **Last updated:** [September 8, 2026, 1:08pm UTC](https://community.ntppool.org/t/queries-after-removing-a-server-from-the-pool/66 "2026-09-08T13:08:13Z")
For those who have removed a server from the pool, how long has it been until NTP queries to your server stopped? One of the servers I recently removed (in the AU zone) is still getting approx 40 queries per second alm… --- ## [Recommendations for GPS-hat for raspberry pi 4](https://community.ntppool.org/t/recommendations-for-gps-hat-for-raspberry-pi-4/4635)
**Author:** [@magnemann](https://community.ntppool.org/u/magnemann)\ **Replies:** 17\ **Last updated:** [September 6, 2026, 10:19am UTC](https://community.ntppool.org/t/recommendations-for-gps-hat-for-raspberry-pi-4/4635 "2026-09-06T10:19:16Z")
Hi, I will build a S1 server with a rpi 4, and need a hat with PPS, no soldering. Antenna on roof, clear sky. Located south in Norway. Important is also accuracy (and price). Anyone have experience on certain hats? … --- ## [Many (probably all) NTP servers in the Philippines don't work](https://community.ntppool.org/t/many-probably-all-ntp-servers-in-the-philippines-dont-work/3440)
**Author:** [@keny](https://community.ntppool.org/u/keny)\ **Replies:** 56\ **Last updated:** [September 5, 2026, 4:04am UTC](https://community.ntppool.org/t/many-probably-all-ntp-servers-in-the-philippines-dont-work/3440 "2026-09-05T04:04:34Z")
Hello, everyone, The following NTP servers in the Philippines don’t work, even though their scores are higher than 10. 222.127.1.19 ~ 27 When we resolve “pool.ntp.org,” the resolved address is one of the addresses abo… --- ## [How to decide if a pool server is "Good Enough" to be in the pool](https://community.ntppool.org/t/how-to-decide-if-a-pool-server-is-good-enough-to-be-in-the-pool/4642)
**Author:** [@gombadi](https://community.ntppool.org/u/gombadi)\ **Replies:** 7\ **Last updated:** [September 4, 2026, 8:52pm UTC](https://community.ntppool.org/t/how-to-decide-if-a-pool-server-is-good-enough-to-be-in-the-pool/4642 "2026-09-04T20:52:47Z")
How to decide if a pool server is “Good Enough” to be in the pool - A simple question to ask but I am not sure it is a simple question to answer. Should “Good Enough” be only based on the monitoring system results. If t… --- ## [Pool enabled IPv6 "backscanning" - input requested](https://community.ntppool.org/t/pool-enabled-ipv6-backscanning-input-requested/4597)
**Author:** [@rbeverly](https://community.ntppool.org/u/rbeverly)\ **Replies:** 47\ **Last updated:** [September 4, 2026, 12:15am UTC](https://community.ntppool.org/t/pool-enabled-ipv6-backscanning-input-requested/4597 "2026-09-04T00:15:39Z")
We (academic security researchers) have been studying the prevalence and characteristics of NTP Pool-enabled IPv6 “backscanning.” In short, there are NTP servers participating in the pool that provide valid time, but ha… --- ## [What's your monitoring setup?](https://community.ntppool.org/t/whats-your-monitoring-setup/3219)
**Author:** [@Badeand](https://community.ntppool.org/u/Badeand)\ **Replies:** 38\ **Last updated:** [September 1, 2026, 3:56pm UTC](https://community.ntppool.org/t/whats-your-monitoring-setup/3219 "2026-09-01T15:56:38Z")
I’ve seen some people here having graphs to show their server traffic and resource usage, presumably Grafana. I’m curious, what are you using, how have you set it up, and what exactly are you monitoring? Where is the da… --- ## [Router buffer-bloating...anybody knew this?](https://community.ntppool.org/t/router-buffer-bloating-anybody-knew-this/4643)
**Author:** [@Bas](https://community.ntppool.org/u/Bas)\ **Replies:** 11\ **Last updated:** [August 31, 2026, 1:25pm UTC](https://community.ntppool.org/t/router-buffer-bloating-anybody-knew-this/4643 "2026-08-31T13:25:31Z")
Hi all, I ran into new/old router problems. Don’t worry my router runs fine, but I noticed some hickups from time to time. Turns out to be buffer-bloating. You can test yourself: Often buffers are set far too high… --- ## [What does it take to get some ip addresses removed from the pool](https://community.ntppool.org/t/what-does-it-take-to-get-some-ip-addresses-removed-from-the-pool/4650)
**Author:** [@gombadi](https://community.ntppool.org/u/gombadi)\ **Replies:** 2\ **Last updated:** [August 31, 2026, 6:19am UTC](https://community.ntppool.org/t/what-does-it-take-to-get-some-ip-addresses-removed-from-the-pool/4650 "2026-08-31T06:19:42Z")
The servers in the range 222.127.1.18 ~ 222.127.1.27 have been discussed in this forum for at least the last 2.5 years. https://community.ntppool.org/t/certain-servers-are-not-replying/3238 https://community.ntppool.or… --- ## [Entry level GPS Stratum 1 NTP Server](https://community.ntppool.org/t/entry-level-gps-stratum-1-ntp-server/4638)
**Author:** [@Dave](https://community.ntppool.org/u/Dave)\ **Replies:** 6\ **Last updated:** [August 28, 2026, 3:00pm UTC](https://community.ntppool.org/t/entry-level-gps-stratum-1-ntp-server/4638 "2026-08-28T15:00:27Z")
Thought this device would be useful for anyone thinking of joining the NTP Pool on a budget. It allows someone to learn about Stratum 1 NTP time serving, without making a large commitment on hardware or software configur… --- ## [20260822 - Are there currently issues with the NTP management systems or is it just me?](https://community.ntppool.org/t/20260822-are-there-currently-issues-with-the-ntp-management-systems-or-is-it-just-me/4644)
**Author:** [@gombadi](https://community.ntppool.org/u/gombadi)\ **Replies:** 3\ **Last updated:** [August 22, 2026, 7:45pm UTC](https://community.ntppool.org/t/20260822-are-there-currently-issues-with-the-ntp-management-systems-or-is-it-just-me/4644 "2026-08-22T19:45:01Z")
Hi Just trying to add a server and seeing some issues. Getting the same result doing an NTP check. Getting this response - The status page is green but the graphs do not seem to be showing anything for the last week… --- ## [Which GPS Raspberry Pi hat for stratum 1 server?](https://community.ntppool.org/t/which-gps-raspberry-pi-hat-for-stratum-1-server/1580)
**Author:** [@lammert](https://community.ntppool.org/u/lammert)\ **Replies:** 8\ **Last updated:** [August 20, 2026, 8:50am UTC](https://community.ntppool.org/t/which-gps-raspberry-pi-hat-for-stratum-1-server/1580 "2026-08-20T08:50:12Z")
My current Stratum 1 server is a Raspberry Pi connected with a Garmin 18x LVC GPS receiver. This is a general-purpose GPS receiver which I previously used with a normal x86 server. The good thing is that it has a long ca… --- ## ["Client distribution" statistic - can you ELI5?](https://community.ntppool.org/t/client-distribution-statistic-can-you-eli5/3644)
**Author:** [@n1zyy](https://community.ntppool.org/u/n1zyy)\ **Replies:** 21\ **Last updated:** [August 19, 2026, 5:39pm UTC](https://community.ntppool.org/t/client-distribution-statistic-can-you-eli5/3644 "2026-08-19T17:39:02Z")
I feel like this is a dumb question, in part because Ask explained it previously in what seems like simple terms, but I am finding that I still don’t fully get it. To use a concrete example, from a server of mine in Kore… --- ## [Server abuse in Philippines](https://community.ntppool.org/t/server-abuse-in-philippines/4179)
**Author:** [@jnd](https://community.ntppool.org/u/jnd)\ **Replies:** 25\ **Last updated:** [August 8, 2026, 6:04pm UTC](https://community.ntppool.org/t/server-abuse-in-philippines/4179 "2026-08-08T18:04:01Z")
I came to check upon my servers and found out that my VPS in Philippines is suffering too many requests, even beyond the provided bandwidth allocation (30 Mbps). What’s worse, the incoming requests aren’t subsiding after… --- ## [Client distribution chart shows 0.000 even with longterm score 20](https://community.ntppool.org/t/client-distribution-chart-shows-0-000-even-with-longterm-score-20/4570)
**Author:** [@meszaros.norbert](https://community.ntppool.org/u/meszaros.norbert)\ **Replies:** 7\ **Last updated:** [July 27, 2026, 12:43pm UTC](https://community.ntppool.org/t/client-distribution-chart-shows-0-000-even-with-longterm-score-20/4570 "2026-07-27T12:43:05Z")
hi everyone, for some days now I have noticed, that my client distribution shows absolute zero even if my score is 20 from all relevant monitors. Have I missed something? Or do I need to do some changes in settings? Tha… --- ## [Documentation: time.orlinum.fr](https://community.ntppool.org/t/documentation-time-orlinum-fr/4593)
**Author:** [@Orlinum](https://community.ntppool.org/u/Orlinum)\ **Replies:** 1\ **Last updated:** [July 26, 2026, 2:42pm UTC](https://community.ntppool.org/t/documentation-time-orlinum-fr/4593 "2026-07-26T14:42:32Z")
Hi, As a follow-up to my previous post introducing myself to the NTP Pool (Hello, I am Orlinum. Nice to meet you ...), I am sharing the documentation for the Stratum 1 node time.orlinum.fr. Available at: https://doc.ti… --- ## [Using an NTP-server behind NAT, it works! After testing a lot. No not many routers/OS can handle it. Really not many](https://community.ntppool.org/t/using-an-ntp-server-behind-nat-it-works-after-testing-a-lot-no-not-many-routers-os-can-handle-it-really-not-many/4580)
**Author:** [@Bas](https://community.ntppool.org/u/Bas)\ **Replies:** 39\ **Last updated:** [July 22, 2026, 3:00pm UTC](https://community.ntppool.org/t/using-an-ntp-server-behind-nat-it-works-after-testing-a-lot-no-not-many-routers-os-can-handle-it-really-not-many/4580 "2026-07-22T15:00:23Z")
Hi all, You know me, have been fighting routers for a long time. Finally cracked it. There is so much crap around, from opensource to expensive. They all fail, and it’s so stupid they fail! It makes no sense. BTW, I’… [Next page](https://community.ntppool.org/c/server-operators/6.md?page=1)