ML
    • Register
    • Login
    • Search
    • Recent
    • Categories
    • Tags
    • Popular
    • Users
    • Groups
    1. Home
    2. Tags
    3. ntp
    Log in to post
    • All categories
    • steve

      An Overview of NTP - CompTIA Network+ N10-007 Prof. Messer
      Training • ntp comptia networking network+ prof messer youtube it training it career video training certification • • steve

      7
      2
      Votes
      7
      Posts
      288
      Views

      melvinsilva

      In network almost every core device (routers, switches and servers) may be NTP Master or Server. It depends on network design who will be the NTP Master, for me is the device which is "closest" to Internet.

    • Suyeins

      Estación de trabajo con 10 segundos de atraso en el reloj
      IT Discussion • windows time synchronization active directory ntp sntp • • Suyeins

      15
      2
      Votes
      15
      Posts
      352
      Views

      dbeato

      @scottalanmiller said in Estación de trabajo con 10 segundos de atraso en el reloj:

      @dbeato said in Estación de trabajo con 10 segundos de atraso en el reloj:

      @scottalanmiller said in Estación de trabajo con 10 segundos de atraso en el reloj:

      Anyone know what the normal variance on Windows boxes is when not using a local time source? How close in seconds would we even expect a site to be able to be?

      You can have it up to 5 minutes from the Domain Controller Servers time.

      No DCs. No AD.

      Gotcha, I am still trying to see what is the issue. 10 seconds is almost unnoticeable. What is the purpose?

    • Donahue

      Domain Time off for some members
      IT Discussion • server 2012 r2 windows time ntp domain vmware • • Donahue

      46
      1
      Votes
      46
      Posts
      788
      Views

      Donahue

      @JaredBusch said in Domain Time off for some members:

      @Donahue said in Domain Time off for some members:

      found it. It was the individual time for that ESXi member. It was running on it's own time, neither host time or any NTP. It was off by the 6 minutes. So for some reason, VMWare was syncing this setting with the host's ESXi clock, not the hardware clock, even though the settings disallow that.

      How do you know the VMware tools was doing the sync?. As I said in my earlier post if windows goes and tries to get the hardware clock no matter what your tool says for heartbeat or times are pretty station it’s going to get the Clock from the host.

      look at the picture I posted above. It was vmtoolsd.exe that was causing it to jump forward and svchost.exe that was correcting it. I found this under event 4616

    • DustinB3403

      Yealink NTP Time Sync Failures
      IT Discussion • yealink ntp time • • DustinB3403

      5
      0
      Votes
      5
      Posts
      400
      Views

      DustinB3403

      I would prefer the phones to go out to 0.us.pool.ntp.org and 1.us.pool.ntp.org for all of their time sync issues but they appear to be having some issue.

      Of which I am unable to determine what that could be with the error provided.

    • CCWTech

      Computers not syncing with Domain Controller. Is my GPO blocking it?
      IT Discussion • time ntp • • CCWTech

      10
      1
      Votes
      10
      Posts
      788
      Views

      dbeato

      @ccwtech said in Computers not syncing with Domain Controller. Is my GPO blocking it?:

      @dbeato said in Computers not syncing with Domain Controller. Is my GPO blocking it?:

      @ccwtech said in Computers not syncing with Domain Controller. Is my GPO blocking it?:

      @dbeato said in Computers not syncing with Domain Controller. Is my GPO blocking it?:

      @ccwtech said in Computers not syncing with Domain Controller. Is my GPO blocking it?:

      Computers in a domain are not syncing time with the Domain Controller (Hyper-V). They are all set to the local CMOS clock.

      I had to restrict the ability for local users to change time by themselves. Is the GP that I created preventing the computers from syncing to the domain?

      0_1538061340847_1.png
      0_1538061350915_2.png

      The time can be in different zones and not affect connectivity to the domain as long as it is 5 minutes from the DC time via UTC. Now I would really make the computers to just point to the DC as their NTP Server instead of anything else.

      I thought they did by default in a domain.

      They should but it is not enforced.

      What do I need to do to enforce it? Or point them to the DC to use?

      @ccwtech said in Computers not syncing with Domain Controller. Is my GPO blocking it?:

      @dbeato said in Computers not syncing with Domain Controller. Is my GPO blocking it?:

      @ccwtech said in Computers not syncing with Domain Controller. Is my GPO blocking it?:

      @dbeato said in Computers not syncing with Domain Controller. Is my GPO blocking it?:

      @ccwtech said in Computers not syncing with Domain Controller. Is my GPO blocking it?:

      Computers in a domain are not syncing time with the Domain Controller (Hyper-V). They are all set to the local CMOS clock.

      I had to restrict the ability for local users to change time by themselves. Is the GP that I created preventing the computers from syncing to the domain?

      0_1538061340847_1.png
      0_1538061350915_2.png

      The time can be in different zones and not affect connectivity to the domain as long as it is 5 minutes from the DC time via UTC. Now I would really make the computers to just point to the DC as their NTP Server instead of anything else.

      I thought they did by default in a domain.

      They should but it is not enforced.

      What do I need to do to enforce it? Or point them to the DC to use?

      Enforce the time source on the DC
      https://blogs.technet.microsoft.com/nepapfe/2013/03/01/its-simple-time-configuration-in-active-directory/

      For clients look at this one
      https://www.altaro.com/hyper-v/configuring-time-synchronization-for-all-computers-in-windows-domain/

    • gjacobse

      Domain Computers: Clock Sync
      IT Discussion • ntp clock domain server 2012 • • gjacobse

      11
      0
      Votes
      11
      Posts
      682
      Views

      dbeato

      @gjacobse said in Domain Computers: Clock Sync:

      DC4 is a virtual machine. changes to it are likely over rode by the Hypervisor or physical hardware that were wrong.

      By updating the physical hardware, and then running w32tm /resync the time updated.

      The issue will resurface again as the BIOS is losing time and will be pulled again wrongly on the host. Have you tried not syncing the time of the VM through the Hypervisor and turning of Time Synchronization for this DC?

    • CCWTech

      Unable to get time to sync on Server 2012 R2 DC
      IT Discussion • ntp server 2012 r2 untangle time • • CCWTech

      35
      0
      Votes
      35
      Posts
      4283
      Views

      CCWTech

      @jt1001001 said in Unable to get time to sync on Server 2012 R2 DC:

      are any of your time services running under a domain accoutn instead of Local Service? Sounds like a service does not have permission to update the time

      Windows Time is set to run under "Local Service" (not local system account)

    • scottalanmiller

      FreeNAS 9.10 Intermittent Active Directory Connection Issues
      IT Discussion • freenas freebsd storage active directory ntp • • scottalanmiller

      4
      1
      Votes
      4
      Posts
      1426
      Views

      scottalanmiller

      FreeBSD does have getent.

    • F

      XenServer7 time sync DC/PDC emulator
      IT Discussion • xenserver xenserver 7 ntp • • frodooftheshire

      6
      3
      Votes
      6
      Posts
      1336
      Views

      coliver

      @frodooftheshire said in XenServer7 time sync DC/PDC emulator:

      @coliver I configurd XEN to pull time from us.pool.ntp.org, and I guess I'll just go into the primary DC and tell W32time to sync with the same server

      I'm trying to recall but @JaredBusch has had issues with the US NTP pool. He may be able to comment further. Otherwise this should work fine.

    • DustinB3403

      Synology NAS 2 Bay - 0.pool.ntp.org Time Server
      IT Discussion • synology ntp • • DustinB3403

      13
      2
      Votes
      13
      Posts
      2620
      Views

      scottalanmiller

      @DustinB3403 said:

      It's up and working, since I forced a time sync, but I'm curious as to why it fell out in the first place.

      It happens, NTP is pretty unstable.

    • bbiAngie

      Time Configuration for HP 2920-48G
      IT Discussion • switch ntp networking • • bbiAngie

      7
      1
      Votes
      7
      Posts
      3077
      Views

      dafyre

      @bbiAngie said:

      @lhatsynot said:

      @bbiAngie said:

      Yea that is what I followed and it didn't work. 45 minutes later I realized this is because this is an isolated stack of switches that is not plugged into the domain yet..... Hard to get a time when they cant talk with the ntp server!!

      facepalm

      Glad you got it sorted out eventually. 🙂

      You really have to love those moments when you are starting to get really frustrated then 30 seconds later you think "Oh my, I am a f-in idiot."

      I worry if I don't have at least one of those a day, lol.

    • Dashrender

      Best Practice for Time Sync for Active Directory Domain Controllers
      IT Discussion • windows active directory ntp sntp • • Dashrender

      41
      0
      Votes
      41
      Posts
      9042
      Views

      scottalanmiller

      I see.

    • bsouder

      Dangerous NTP hole
      IT Discussion • ntp hack vulnerability • • bsouder

      2
      0
      Votes
      2
      Posts
      1259
      Views

      scottalanmiller

      Looks like the issue is with NTP dæmons, not with NTP clients. So in the SMB, very few people would be impacted. Running internal NTP is uncommon until you are relatively large.