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DNSDNS

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other re...

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Network Architect

Over 15 years' experience in enterprise network design and implementation focused on routing, switching, Wi-Fi and Cisco ISE.

Troubleshooting Solution

Windows domain DNS issues!

byGibo
34
Multiple Host A records on the same IP address in domain DNS servers? Is that valid?
Article

DNS Troubleshooting made easy

6
Most DNS problems are VERY easily troubleshot and identifiable if you can follow the steps a DNS …
Video
Courses
Post

Microsoft has identified a security (DNS) vulnerability that…

1
Microsoft has identified a security (DNS) vulnerability that attackers can exploit and has released …
Troubleshooting Solution

What am I missing in my DNS to have valid emails and not beeing categorized as spam?

33
Hi,
Some clients of us are blocking our mails coming to them.
ProofPoint told them that :
" We're seeing
Troubleshooting Solution

NSLOOKUP failing on second dns server

43
I have 2 dns servers on our network
server13
       windows server 2008 R2
server18
       …
Post

CloudFlare and APNIC have launched a free DNS service @ …

3
CloudFlare and APNIC have launched a free DNS service @ 1.1.1.1 that claims to prevent your ISP from…
Troubleshooting Solution

Domain Controller and Desktop DNS

27
I have setup my first Windows Server 2019 with AD and DNS and DHCP.  Everything works fine.  My …
Post

It's always exciting around here! We're thrilled to …



It's always exciting around here! We're thrilled to expand our partnership with ConnectWise
Troubleshooting Solution

Disable negative caching in Windows DNS service

byzc2
27
This is a follow up for this question since the problem still is not resolved.

We have an hMailServer …
Troubleshooting Solution

Should my Windows Hyper-V server run DNS?

22
I have a Windows 2016 Hyper-V server which hosts a Primary Domain Controller (PDC01) and a SQL …
Troubleshooting Solution

DCDIAG DNS errors

28
can anyone provide a solution for these errors? I am a little new to this DNS stuff.


Post

The Global Cyber Alliance has a new DNS service to help …

The Global Cyber Alliance has a new DNS service to help combat malware - check out Quad9
Troubleshooting Solution

gethostbyname() returns incorrect information

18
This Debian linux system recently started producing errors due to incorrect DNSBL lookups in Apache …
Troubleshooting Solution

Why can't I access my company web site (hosted outside) when INSIDE my company network

24
My company web site is hosted externally.
https://www.radio-ip.com/en/
And I can reach it with my work …
Troubleshooting Solution

Win 7 Internet connection

bymcrmg
88
Hi,

We have a pc was rebuilt. WIFI works fine on that pc, but when we plug in a cable. The …
Troubleshooting Solution

DNS issue confirmed with MXToolbox

10
I just started with a company that originally had there DNS hosting with GoDaddy and 3 months ago …
Troubleshooting Solution

How do I use my Windows DNS server on my .local domain

9
I am setting up a UBUNTU 20.04 vm and I am having an issue with the DNS. I can lookup external …

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