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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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Expert Spotlight
M365 Apps & Services MVP | Windows Insider MVP | MCT | Author | eJPTv2 | eCPPTv2 | CRTP | CRTE | CRTO | Security+ | CEH | Pentest+

Experienced Messaging Specialist with a demonstrated history of working in the information technology and services industry.

Troubleshooting Solution

DNS Query 2 to 4 seconds Intermittently on Win 2016 Server

42

Hi All,


I am experiencing a DNS lookup problem on one of my servers.


Intermittently, for around 30

Article

DNS Troubleshooting made easy

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

Emails keep going into Spam no matter what we do

49

Hi

My customer bought a domain allrounddomain.com and one email product called "Professional Email

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…
Advice Solution

Emails stuck in Exchange 2019 queue after public IP address change

20

Hello - We are running an on-premises Exchange 2019 server with CU12. We changed the public IP

Troubleshooting Solution

Hotmail pop3 & SMTP config

60
does anybody know what to put in the pop3 and smtp host server in any kind of e-mail client for …
Troubleshooting Solution

Need help setting up a 2nd DNS server on existing network

15

Hello - we are setting up a satellite office that will be connected via VPN tunnel to our main

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

DNS Issue on Business Network

12

Troubleshooting DNS issue on business network for a customer.  Environment consists of the

Troubleshooting Solution

Email kickbacks with yahoo mail with DNS and SPF records.

24

Hi Experts.  Recently google, yahoo, and aol etc have put in place measures to prevent spoofing,etc.

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

DNS - can't access public web site from behind our firewall

14

I have DNS issues.


Internally, we cannot reach our public web site.  So, from our company, named

Troubleshooting Solution

Are both A records and CNAMES absolutely necessary?

8

Today we had a missed payment issue at wix.com that shut us down. 


They disconnected the domain which

Troubleshooting Solution

Can I create same CNAME for different hostnames

byjskfan
11

Can I create same CNAME for different hostnames


I want to create  CNAME record  abc.mydomain.org for

Post

Haven't tried it out yet, but this looks cool.  Why …

Haven't tried it out yet, but this looks cool.

Why DNSCrypt is so significant
In the same
Advice Solution

Need help setting up SPF, DKIM, and DMARC in DNS.

25

Need help setting up SPF, DKIM, and DMARC for e-mail. Most of the e-mail hosts have configured

Troubleshooting Solution

Windows 2019 DC not able to access internet.

byauldh
14

Created a new Windows 2019 DC for my lab. I cannot get the server now as a DC to connect to the

Article

Some important DNS concepts for good diagnosis and good configuration

2
I wrote this article to explain some important DNS concepts that should be known to avoid some typical configuration errors I often see in forums.

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