Register a free account to unlock additional features at BleepingComputer.com
Welcome to BleepingComputer, a free community where people like yourself come together to discuss and learn how to use their computers. Using the site is easy and fun. As a guest, you can browse and view the various discussions in the forums, but can not create a new topic or reply to an existing one unless you are logged in. Other benefits of registering an account are subscribing to topics and forums, creating a blog, and having no ads shown anywhere on the site.


Click here to Register a free account now! or read our Welcome Guide to learn how to use this site.

Latest News:    NSA shares zero-trust guidance to limit adversaries on the network

Featured Deal: Enjoy quick, compatible data transfers with this $59.99 portable SSD

Latest Buyer's Guide:    Hotspot Shield VPN review

Generic User Avatar

Windows Server 2016 - DNS/AD problem

Started by ramon82 , Sep 10 2023 01:26 PM

  • Please log in to reply
13 replies to this topic

#1 ramon82

ramon82

  • Avatar image
  • Members
  • 13 posts
  • OFFLINE
    •  
  • Local time:06:59 AM

Posted 10 September 2023 - 01:26 PM

Windows Server 2016 - DNS/AD problem

 

Hi all - at one point our DC froze and we had to do a restart. It installed a lot of updates and then once it got up and running again we started experiencing problems with DNS, passwords, mapped drives etc - please refer to screenshots. Its as if the communication between the desktops and the server got out of sync somehow.

 

Any idea what we can do please?

 

Thank you

Attached Files


BC AdBot (Login to Remove)

 

#2 cryptodan

cryptodan

    Bleepin Madman


  • Avatar image
  • Members
  • 33,826 posts
  • OFFLINE
    •  
  • Gender:Male
  • Location:USA
  • Local time:04:59 AM

Posted 10 September 2023 - 01:31 PM

What's the time and date on the server?

US Navy Veteran from 2002 to 2006

Masters in Computer and Digital Forensics Expert - Stevenson University Alumni 2015

Arch Desktop - https://termbin.com/epij

Arch Laptop - https://www.termbin.com/dnwk

Ubuntu Server - https://termbin.com/zvra

#3 ramon82

ramon82
  • Topic Starter

  • Avatar image
  • Members
  • 13 posts
  • OFFLINE
    •  
  • Local time:06:59 AM

Posted 10 September 2023 - 01:39 PM

Its exactly like the clients - and the actual time now


#4 cryptodan

cryptodan

    Bleepin Madman


  • Avatar image
  • Members
  • 33,826 posts
  • OFFLINE
    •  
  • Gender:Male
  • Location:USA
  • Local time:04:59 AM

Posted 10 September 2023 - 01:47 PM

Can you ping the dns server from the clients?

US Navy Veteran from 2002 to 2006

Masters in Computer and Digital Forensics Expert - Stevenson University Alumni 2015

Arch Desktop - https://termbin.com/epij

Arch Laptop - https://www.termbin.com/dnwk

Ubuntu Server - https://termbin.com/zvra

#5 ramon82

ramon82
  • Topic Starter

  • Avatar image
  • Members
  • 13 posts
  • OFFLINE
    •  
  • Local time:06:59 AM

Posted 10 September 2023 - 01:51 PM

Yes both with IP and hostname however the reply I am getting is in IPv6


#6 cryptodan

cryptodan

    Bleepin Madman


  • Avatar image
  • Members
  • 33,826 posts
  • OFFLINE
    •  
  • Gender:Male
  • Location:USA
  • Local time:04:59 AM

Posted 10 September 2023 - 02:09 PM

What happens if you ping the ipv4 address of dns?

US Navy Veteran from 2002 to 2006

Masters in Computer and Digital Forensics Expert - Stevenson University Alumni 2015

Arch Desktop - https://termbin.com/epij

Arch Laptop - https://www.termbin.com/dnwk

Ubuntu Server - https://termbin.com/zvra

#7 ramon82

ramon82
  • Topic Starter

  • Avatar image
  • Members
  • 13 posts
  • OFFLINE
    •  
  • Local time:06:59 AM

Posted 10 September 2023 - 02:14 PM

When I ping by hostname I get an IPv6 reply

When I ping by IP I get a lan IPv4 reply

#8 cryptodan

cryptodan

    Bleepin Madman


  • Avatar image
  • Members
  • 33,826 posts
  • OFFLINE
    •  
  • Gender:Male
  • Location:USA
  • Local time:04:59 AM

Posted 10 September 2023 - 02:16 PM

Check AD to see if DNS is configured for both ipv4 and ipv6 and turn on if not.

US Navy Veteran from 2002 to 2006

Masters in Computer and Digital Forensics Expert - Stevenson University Alumni 2015

Arch Desktop - https://termbin.com/epij

Arch Laptop - https://www.termbin.com/dnwk

Ubuntu Server - https://termbin.com/zvra

#9 ramon82

ramon82
  • Topic Starter

  • Avatar image
  • Members
  • 13 posts
  • OFFLINE
    •  
  • Local time:06:59 AM

Posted 10 September 2023 - 02:50 PM

Excuse my ignorance, can you pls guide me 


#10 cryptodan

cryptodan

    Bleepin Madman


  • Avatar image
  • Members
  • 33,826 posts
  • OFFLINE
    •  
  • Gender:Male
  • Location:USA
  • Local time:04:59 AM

Posted 10 September 2023 - 03:07 PM

Go through this

https://learn.microsoft.com/en-us/windows-server/networking/dns/troubleshoot/troubleshoot-dns-server

Check to see if the ip address of server didn't change and if it did you may need to change the ip within the dns pool server check.

US Navy Veteran from 2002 to 2006

Masters in Computer and Digital Forensics Expert - Stevenson University Alumni 2015

Arch Desktop - https://termbin.com/epij

Arch Laptop - https://www.termbin.com/dnwk

Ubuntu Server - https://termbin.com/zvra

#11 ramon82

ramon82
  • Topic Starter

  • Avatar image
  • Members
  • 13 posts
  • OFFLINE
    •  
  • Local time:06:59 AM

Posted 10 September 2023 - 03:53 PM

I am a bit lost...can you direct me to a simple step-by-step which i can follow?


#12 cryptodan

cryptodan

    Bleepin Madman


  • Avatar image
  • Members
  • 33,826 posts
  • OFFLINE
    •  
  • Gender:Male
  • Location:USA
  • Local time:04:59 AM

Posted 10 September 2023 - 04:07 PM

There is no simple guide for windows server and its roles like dns.

US Navy Veteran from 2002 to 2006

Masters in Computer and Digital Forensics Expert - Stevenson University Alumni 2015

Arch Desktop - https://termbin.com/epij

Arch Laptop - https://www.termbin.com/dnwk

Ubuntu Server - https://termbin.com/zvra

#13 ramon82

ramon82
  • Topic Starter

  • Avatar image
  • Members
  • 13 posts
  • OFFLINE
    •  
  • Local time:06:59 AM

Posted 10 September 2023 - 11:22 PM

Hi again i discovered that this seems to be an AD issue through event viewer:
 
The Security System has detected a downgrade attempt when contacting the 3-part SPN 
 
 ldap/JUPITERDC01.jupiter.local/jupiter.local@JUPITER.LOCAL 
 
 with error code "The attempted logon is invalid. This is either due to a bad username or authentication information.
 (0xc000006d)". Authentication was denied.
 
​Any ideas??

#14 cryptodan

cryptodan

    Bleepin Madman


  • Avatar image
  • Members
  • 33,826 posts
  • OFFLINE
    •  
  • Gender:Male
  • Location:USA
  • Local time:04:59 AM

Posted 11 September 2023 - 05:39 AM

Have a read here

https://community.spiceworks.com/topic/304890-how-to-resolve-event-id-40960-error

Last post

US Navy Veteran from 2002 to 2006

Masters in Computer and Digital Forensics Expert - Stevenson University Alumni 2015

Arch Desktop - https://termbin.com/epij

Arch Laptop - https://www.termbin.com/dnwk

Ubuntu Server - https://termbin.com/zvra

Back to Windows Server


1 user(s) are reading this topic

0 members, 1 guests, 0 anonymous users


  1. BleepingComputer.com
  2. → Microsoft Windows Support
  3. → Windows Server
  4. Privacy Policy
  5. Rules ·