Questions tagged [domain-name-system]

The Domain Name System, usually referred to by the acronym DNS, is a hierarchical, distributed database where the keys are domain names. Questions involving publicly accessible domains should include the real, Fully Qualified Domain Name (FQDN)

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How to get a Let’s Encrypt wildcard certificate via cert-manager in Azure without changing DNS?

How to get a Let’s Encrypt wildcard certificate for (an already working subdomain in) Azure? I get https://cert-manager.io/docs/tutorials/getting-started-aks-letsencrypt/ running But it uses only the ...
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0 answers
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DMARC, SPF and DNS wildcards

My domain configuration has one domain and three subdomains, one of which is identical to the mail server's hostname: example.com sales.example.com internal.example.com mail.example.com I initially ...
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Your DKIM signature is not valid - opendkim

I'm running postfix server with few "features" like spf, dmarc and DKIM. SPF and DMARC works fine and when I sent an email to my gmail account I see they PASS, however DKIM shows "FAIL&...
1 vote
1 answer
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Trouble with DNS resolution on and Microk8s cluster

My microk8s cluster is running on a centos8 vm and I have some issues with DNS resolution of my pods. Nameserver are at x.x.x.101 and x.x.x.100 both are ping able from within the pods and I can also ...
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0 answers
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How to handle CNAME requirement for zone apex DNS record in AWS Route53 and Cloudflare

It is not possible to create a CNAME for the apex zone in Route53 - it violates RFC. Route53 provides for an ALIAS record, but this record has to point to another AWS service and is not capable of ...
0 votes
1 answer
26 views

DNS Configuration for Azure Load Balancer with Public IP

I'm configuring a load balancer in Azure to distribute traffic to backend VMs for my web application (most likely just a singular VM actually). I'm a bit confused about the DNS setup. Here's what I ...
9 votes
2 answers
2k views

DNS and Active Directory configuration for a branch office

We've got a branch office with no on-site services at the moment, and we'd like to change that. The biggest goal is to setup some file servers but faster logins and DNS resolution will be welcome as ...
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how to ingress correctly in kuberenetes with nginx-ingress

I'm new to k8s and I'm having slight trouble setting up a local cluster on virtual machines and have it be accessible from at least my host machine. setup. I've a local cluster consisting of three ...
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Devilbox - error, "No Host DNS record found. " even after adding folder name in /etc/hosts/

I am using Devilbox and have been learning through documentation on how to work with it, I have created a folder inside /data/www/ inside devilbox folder and before that I have excluded the mention of ...
-2 votes
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How can I configure in IIS to get on app A when I write in browser address "a" and to get on app B when I write in browser address "b"?

Details: Windows Server 2019 IIS version 10.0.17763.1 Application A: DNS aaa.aaa.aaa.com port 443 Application B: DNS bbb.bbb.bbb.com port 8888 Both applications hosted on the same server (same IP) and ...
4 votes
2 answers
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DNS IPv6 settings on Domain Controllers

Both in my lab testing and on real installation I saw that, after a dcpromo (done via "Server Manager" on Windows 2016), a loopback IPv6 address is automatically added on the interface DNS settings (...
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1 answer
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Automatically generating PTR records in reverse lookup zone

I am working on setting up DNS in our environment. In the test bed, I was creating some A records and PTR records in the forward and reverse lookup zone files. So, I was wondering instead of adding ...
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1 answer
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How to configure failover cluster to register its records automatically after it deleted from DNS server?

Windows Server 2016 failover cluster with two nodes. Unfortunately the DNS record for the cluster name has been deleted and not created automatically. How to configure failover cluster to register its ...
35 votes
3 answers
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How do registrars register authoritative name servers with root name servers?

I understand that domain name registrars, for each domain they manage, register the authoritative name servers for that domain with its top-level root name server. My question is: how do they do this?...
4 votes
1 answer
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Unbound refuses requests from localhost even though `access-control: 127.0.0.1 allow_snoop`

This is my unbound.conf server: interface: 0.0.0.0 access-control: 10.0.0.0/8 allow_snoop access-control: 127.0.0.1 allow_snoop access-control: 192.168.0.0/16 allow_snoop ... Reading the ...
0 votes
1 answer
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DNS Oddities with Microsoft Dynamics Finance and Operations

Question Is it valid for a subdomain to use different nameservers to the parent domain without the parent domain's DNS servers providing NS records for the subdomain? For example: Running Resolve-...
0 votes
1 answer
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unbound local-zone and local-data: am I doing it right?

I'm playing with unbound to forward DNS queries to an authoritative DNS server, cache them, and also add additionals local informations. My config is pretty straightforward: /etc/unbound/unbound.conf: ...
6 votes
6 answers
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hostname -f says "hostname: the specified hostname is invalid". Guess why?

hostname -f says "hostname: the specified hostname is invalid". The hostname (FQDN) specified in /etc/hostname is also listed in /etc/hosts and is pingable. No actual DNS server yet of the host knows. ...
3 votes
1 answer
6k views

Dynamic DNS registration for VPN clients

I've got a VPN server set up in my Active Directory on a remote network. (VPN Server is a separate box from DNS/AD) When I dial into the network (the client machine is not a member of the AD) the ...
0 votes
1 answer
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DNS Migration from 2K12 dc to 2k22 dc

I am upgrading two domain controllers from Windows Server 2012 to Windows Server 2022. I have created two Windows Server 2022 servers, and am migrating the roles. The old servers have AD DS and DNS ...
46 votes
5 answers
77k views

Find DKIM and DMARC Records?

Is there a method to find a domain's DKIM and DMARC records using dig or nslookup? I have attempted to do the following: dig somedomain.org any returns many records, but not the known DKIM and ...
6 votes
4 answers
12k views

Is it possible to find a list of all DKIM keys for a domain?

a DKIM-record is identified by its selector, which might be default, dkim or something else alltogether (and there might be multiple). When making sure that an e-mail's content is valid, the DKIM ...
1 vote
1 answer
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how to add a dns ro resolve wireguard endpoint when using wg setconfg instead of wg-quick

Following wireguard docs for ordinary-containerization it works with something similar to this configuration file: # /etc/wireguard/wg0.conf # [Interface] PrivateKey = ...
0 votes
0 answers
10 views

Ajax not loading show server response issue

i'm using lightspeed server when i hit a page it taking to much time to load ajax request while first it was working fine when i change DNS it slow down and lihgtspeed cache not working for loggedin ...
-2 votes
0 answers
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Domain SRV records in DNS

I am configuring an Active Directory domain in an air-gapped network on Windows Server 2016. I can ping my DC and I am in the same subnet, pulling DHCP from the router, while the DC IPv4 is static. I ...
1 vote
1 answer
34 views

In kubernetes DNS queries fail between nodes

I have an issue with kubernetes and coreDNS that I am not able to solve. System information 1 master + 2 workers Red Hat Enterprise Linux release 9.3 (Plow) k8s: v1.28.7 flannel: v0.24.2 coreDNS: v1....
0 votes
0 answers
14 views

Virtual host on Apache2 for Mautic "This site can't be reached" on specified subdomain (but can be reached somewhere else)

I am configuring a brand new Mautic 5.0.3 instance on a Debian GNU/Linux 12 (bookworm) in AWS shared server with other 3 webs. Let's say (for security reasons) that its on aaaa.com. I have configured ...
0 votes
0 answers
55 views

dns problems in self managed aws ec2 cluster with aws-vpc-cni

I'm new to k8s and I've been trying to learn it. I faced a problem with trying to setup aws-vpc-k8s-cni on my fresh k8s cluster with coredns. Here's the problem in detail. Cluster & Network ...
0 votes
1 answer
42 views

DNS records at Azure and Google - do both need the entire set of records?

We are migrating from Azure to Google. Google is currently storing our DNS records. Simply put, do we need to put all the A records in both places? Or is DNS smart enough to loop through it's list ...
7 votes
2 answers
12k views

What's required for a nameserver to be registered?

I'm trying to change nameservers for some of my domains at GoDaddy, but I occasionally run into "Nameserver not registered" problems, and then I'm not allowed to set the nameservers. Here are the ...
7 votes
3 answers
5k views

Domain Controller DNS Best Practice/Practical Considerations for Domain Controllers in Child Domains

I'm setting up several child domains in an existing Active Directory forest and I'm looking for some conventional wisdom/best practice guidance for configuring both DNS client settings on the child ...
1 vote
1 answer
4k views

Nginx, second subdomain not working

I used the CNAME wild card DNS entry like: @ IN A ip.add.re.ss www IN CNAME @ * IN CNAME @ My root domain.com and sub1.domain.com are accessible (on the same digitalocean droplet)....
-1 votes
1 answer
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DNS setting up an incoming A record

An external location has an external DNS that needs to connect to our server to access a website from on our server. Their client email and DNS are all not on our server. Our server hosts their ...
0 votes
0 answers
38 views

Install SSL Certificate for Docker Container on EC2

We are running an NGINX Server on a Docker Container which is hosted on an EC2 instance. Our Domain is registered with Amazon Route 53 but it seems like, there is missing an SSL Certificate on Docker ...
-1 votes
1 answer
26 views

DNS Not Update from Last 7days

I Update my DNS in Network solution domain providers but my nameserver not updated yet from last 7days i checked dns many time but not update my website still not pointing hosting www.itcrew.in
0 votes
1 answer
38 views

bind9 conditional forwarding not working as expected

Need your experience advice, We have a BIND9 DNS server that operates both privately and publicly for the domain xyz.com. I use the private DNS for certain secure nodes on our local network. I want ...
90 votes
3 answers
107k views

Multiple TXT fields for same subdomain

I would like to understand if multiple TXT records for the same subdomain are ok or could lead to issues. In particular, we have the requirement for one SPF record and one Google Domain Verification ...
0 votes
3 answers
72 views

New Server 2022 DNS server replicated from soon to be old DNS - clients have to use fqdn for one zone

I recently replaced the existing domain controllers with two new ones that also function as DNS servers. After testing that the replication was working, I renamed the new DNS IP with the old DNS IP, ...
0 votes
1 answer
49 views

Can I delete parent DNS zone of AD domain

We currently have a single AD domain internal.mycompany.com There are currently 2 independent authoritative copies of the parent DNS zone mycompany.com. One copy is managed by the domain controller, ...
1 vote
1 answer
32 views

How to delegate subdomain to samba DC?

I set up a samba server and I'd like all the clients on my network to use the same DNS server. Diagram I have configured the servers (ubuntu/bind9:9.18-22.04_beta) as below. I don't quite understand ...
0 votes
0 answers
68 views

getting NXDOMAIN, but more-verbose host lookups are working

i could not log into a server via SSH: ssh: Could not resolve hostname apex.swiftinit.org: Name or service not known i get the same error with dig: $ dig +tcp apex.swiftinit.org CNAME ; <<>&...
0 votes
3 answers
6k views

Windows DNS won't start on reboot

Last night a Windows Server 2008 R2 machine I maintain automatically rebooted after installing updates, without starting the DNS service. Since the machine is the network's DNS server, I got a call in ...
23 votes
5 answers
89k views

iptables rules to allow HTTP traffic to one domain only

I need to configure my machine as to allow HTTP traffic to/from serverfault.com only. All other websites, services ports are not accessible. I came up with these iptables rules: #drop everything ...
-1 votes
1 answer
59 views

No DNS record or entry in Host file, but can still access IIS site?

We have a VM in azure (with no Public IP), that has a bunch of sites inside the IIS. These sites are only accessible from inside the VM or whilst being connected to our OpenVPN. There is no DNS record ...
-1 votes
0 answers
32 views

DNS lookup is not happening

I have two identical servers on AWS. On one server when a form is submitted, the network timings are 7.22s. On the other server it is 2.38s. The code is same on both the servers. The only difference I ...
1 vote
0 answers
69 views

If a name server is down for a while, does the registrar change DNS of my domain because arent working

I have an infrastructure with my own nameservers, and these servers were offline for a week. On the server, there are many websites managed through WHM/CPANEL. After recovering the infrastructure, ...
0 votes
1 answer
51 views

Domain name resolves to IP address

I wanted to get clarity on this issue (instead of the usual try-stuff-till-it's-fixed approach). As a developer and curious person I really want to understand what's going on here so I can ...
0 votes
1 answer
8 views

Wrong IP address returned for pfSense host name on a router with multiple LANs when using DNS Forwarder/Resolver

Question moved from StackOverflow: Running pfSense 2.4.4 (first saw the problem in 2.0.3) using DNS Forwarder or DNS Resolver for Split-DNS with multiple LANs. LAN1 is 10.10.10.0/24 and LAN2 is 192....
1 vote
0 answers
32 views

No DNS for root? [migrated]

It seems my configuration for root doesn't have access to DNS even though my lower-privileged user does. $ ping google.com PING google.com (142.251.32.110) 56(84) bytes of data. 64 bytes from 142.251....
0 votes
1 answer
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Users cant nslookup my windows server 2019 domain

when i ipconfig /all in my server i see this: IPv6 Address. : 2804:7f0:6880:a506:463a:e968:cf0e:177d(Preferred) IPv6 Address. : 2804:7f0:6880:e6d7:1e98:ecff:fe2c:2398(Preferred) the first one is the ...

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