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Windows Server 2016 - DNS/AD problem

Started by ramon82 , Sep 10 2023 01:26 PM

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#1 ramon82

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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

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#2 cryptodan

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Posted 10 September 2023 - 01:31 PM

What's the time and date on the server?

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#3 ramon82

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Posted 10 September 2023 - 01:39 PM

Its exactly like the clients - and the actual time now


#4 cryptodan

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Posted 10 September 2023 - 01:47 PM

Can you ping the dns server from the clients?

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#5 ramon82

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Posted 10 September 2023 - 01:51 PM

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


#6 cryptodan

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Posted 10 September 2023 - 02:09 PM

What happens if you ping the ipv4 address of dns?

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#7 ramon82

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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

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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.

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#9 ramon82

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Posted 10 September 2023 - 02:50 PM

Excuse my ignorance, can you pls guide me 


#10 cryptodan

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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.

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#11 ramon82

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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

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Posted 10 September 2023 - 04:07 PM

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

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#13 ramon82

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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

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Posted 11 September 2023 - 05:39 AM

Have a read here

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

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