DNS stands for the Domain Name System, a hierarchical, distributed database where the keys are domain names.

learn more… | top users | synonyms

1
vote
0answers
13 views

No RRSIGs found

I had a dnssec expiration and since redoing everything, I get the following error No RRSIGs found from verisign debugging These are the exact steps I use to produce the key and signatures. What ...
1
vote
1answer
20 views

Multiple MX records pointing to multiple servers for a single domain

Is it possible to have multiple MX records pointing to multiple mail servers for a single domain? Must all mail accounts be identical on each of those servers, or is it possible to have ...
0
votes
4answers
282 views

How much time does it take for new A-records to start working?

I created a subdomain pointing to another IP address with an A-record about two hours ago. When I try to ping, like pinging from different locations (using online services), I get Unknown host:. The ...
1
vote
0answers
19 views

504 gateway timeout when accessing by hostname, but not by IP

I'm using Amazon EC2 with Elastic Load Balancing. On my web-based application, end-users connect to app.myapp.com get a 504 gateway timeout error when performing certain operations like converting a ...
0
votes
0answers
10 views

Windows SBS 2008 - Registering remote VPN users in DNS

Our server runs Windows SBS 2008 and we're utilising Routing and Remote Access for VPN connectivity. Some of our remote VPN users have workstations which are attached to our domain. When these users ...
0
votes
0answers
15 views

Inconsistent DNS resolution behavior (dns_probe_finished_nxdomain)

I have a LAN with a windows server 2012 DC configured with DNS and DHCP. On occasion, clients will receive a dns_probe_finished_nxdomain error when browsing the web. This is not a consistent problem. ...
0
votes
0answers
21 views

GNU-Mailman, MS Exchange, and SPF

We are currently in the process of setting up GNU-Mailman to handle our customer mailing list. We have remote hosting (Hostgator Business Plan) for our website and for the GNU-Mailman install and we ...
-1
votes
1answer
17 views

Exim4 E-mail server in Azure can not receive emails [on hold]

I'm running one VM in one cloud service, the system of this VM is Linux, and it runs Exim4 e-mail server. The server can send e-mails, but when people want to send the e-mail back, it got this ...
-1
votes
0answers
56 views

from gmail -> Our system has detected that this 550-5.7.1 message is likely unsolicited mail.

I installed opendkim and configured it on my mailserver. every test including http://dnsviz.net/d/nyctelecomm.com/dnssec/ and mxtoolbox was returning a perfect rating. Then today, without a restart ...
1
vote
1answer
21 views

Bind views match-client from zone delegation

i've a problem with views using Bind9. I've a Microsoft DNS server with a domain "example.com" configurated to delegate the sub-domain "ds.example.com" to Bind DNS Server. In the Bind server i've ...
-4
votes
1answer
31 views

AWS Server - holds 4 sites after DNS change 1 sites A record does not change

I have an amazon AWS server running Ubuntu. It currently holds 4 websites, and I changed the DNS for these sites at 08:00 this morning. It is now 15:30 in the afternoon, I set the TTL down to 60 ...
0
votes
0answers
9 views

error creating a DNS resolver socket: Network is unreachable at /usr/share/perl5/Mail/SpamAssassin/DnsResolver.pm line 235

I'm getting lately after removing ip6 (to get KVM working) from /etc/network/interfaces the following error: error creating a DNS resolver socket: Network is unreachable at ...
0
votes
1answer
21 views

Redirect subdomain to an Apache Virtual Host

I have a website "example.com" hosted on a provider that allows me to manage my own DNS. I want example.com to point to the provider's IP address but I want "subdomain.example.com" to point on my own ...
0
votes
0answers
12 views

Vestacp custome nameservers [on hold]

I am using vesta control panel, as per their documentation, i have created custom nameservers, here what i did... I have registered both nameservers using 2 different ips at my domain registrar. I ...
0
votes
1answer
24 views

Alias (CNAME) record cannot be added to this DNS Name [duplicate]

In Microsoft DNS, I'm trying to setup a simple DNS Alias (CNAME) pointing from domain.com to www.domain.com. I also want to forward www.domain.com to a specific IP. In other words, I want to do ...
-3
votes
0answers
18 views

Setting up a windows server domain network and registration [on hold]

I am trying to create a domain network for my medium sized firm. I have created that successfully using windows server 2012 and joining clients to the domain, However I used a domain name that is ...
-2
votes
0answers
20 views

Open Source IPAM with feature to automatically manage external DNS and DHCP [on hold]

Can you please suggest some open source and free software that will cover the following features for centralized management of IP addresses. Should have basic IPAM features (IPv4, IPv6, VLAN ...
2
votes
1answer
48 views

I can't get https://sendsonar.com working but sendsonar.com and https://www.sendsonar.com work just fine

I'm trying to get our domain - https://sendsonar.com - to go to https://www.sendsonar.com but for some reason this is failing. Here's the curl output: yo@ubuntu-i386:~/Sonar$ curl -kvI ...
2
votes
0answers
33 views

how to prevent loadbalancer from going offline?

i plan to setup a load balancer for a webproject but there is a major issue in my head: a typical loadbalancer would be: (provided by nginx upstream) Server #1 accepts all requests and forwards them ...
-1
votes
1answer
26 views

How to specify a DNS Slave server, that is on a different domain, in the appropriate zone file on the master naming server?

I am unsure if my question makes sense, but I am working on configuring a DNS Master/Slave setup. We currently have two domains. For privacy purposes, I will use "example" as my domain, we have ...
0
votes
0answers
20 views

DNS UDP Load Balancer - Is there X-forward-for like options? [duplicate]

We're using the Rackspace's UDP load balancer - however its only giving us internal 10.x.x.x addresses from our clients, and not the actual "external" of the external connection. On an HTTP Server I ...
1
vote
1answer
47 views

DNS errors from certain locations, but not all

When any subdomain of thenifty.me is loaded, users cannot access it from certain locations (Canada, Ukraine, or even certain locations in US). Chrome reports: The server at *.thenifty.me can't be ...
-6
votes
0answers
36 views

Domain dns response [on hold]

I have enom account They are my domain registrar Last time i had problem with my account They freezed my account and i sorted out my problem then they were reactivated my account But when i ...
1
vote
0answers
29 views

Prevent postfix appending search domain

I have postfix running on OpenBSD, and I'm having trouble with it appending a search domain when none is configured in either postfix or the local DNS server (dnsmasq). My domain has a wildcard CNAME ...
-3
votes
1answer
76 views

sendmail - “host name lookup failure” but dig shows MX records [on hold]

I'm running sendmail on a CentOS 5 server. Yesterday although several emails went through, emails going to domain-co.mail.eo.outlook.com would result in "hot name lookup failure" and the emails got ...
0
votes
0answers
3 views

Why does nslookup for espn.com give an IP that goes to go.com? [migrated]

If I do an nslookup on espn.com, an IP is returned 199.181.132.250. When I put this value in the browser I get go.com. If I had add a 'Host header to the request, I still end up on go.com. What am I ...
0
votes
0answers
17 views

Exim mail not signing DKIM. Don't find whats wrong. (detailed description of steps taken)

I'd like to setup my fresh server (ubuntu) for hosting my www.bolleboos.be website and enable sending of email from my php scripts. So... I installed apache, php, mysql, ... and for the mail exim4 ...
-2
votes
0answers
15 views

How to make my hime network discoverable? [closed]

I setup a DNS server and I want to make it publicly available but my router is not reachable from other networks Dlink 2560, NAT is on and port 53 is forwarded
0
votes
1answer
22 views

Set MX records on a CNAME domain (heroku app)

I have a heroku app on a subdomain like x.herokuapp.com which is mapped to my domain name via a CNAME record. I want emails to be handled by zohomail so I've tried setting up MX records but these seem ...
3
votes
2answers
174 views

Do CDN providers run their own DNS servers?

In order to have efficient CDN, it needs to direct requests to the server nearest to the requester. How do they do that? Do they run their own DNS server that, when asked to resolve an address, it ...
5
votes
3answers
298 views

Is there a way to programatically update DNS records?

Is there a standard way to programatically update DNS records? Services like Route 53 do offer programmatic access, but is that possible in a generic way using some standard protocol? Or it depends on ...
23
votes
8answers
2k views

What's the maximum number of IPs a DNS A record can have?

I have a strange idea - let multiple people/organizations host the same application, and let all their nodes be accessible via a single domain name. That's in order to have, let's say, a really ...
1
vote
2answers
35 views

Dnsmasq: Redirect entire domain to localhost only for specific MAC Addresses

I'd like to redirect example.com to the local host, but only for specific MAC addresses. Obviously, specifying address=/example.com/127.0.0.1 in dnsmasq.conf does this for everyone. Is there any ...
3
votes
1answer
228 views

How would you setup a up an A record for any negative query?

How would I go about setting up an A record for in Bind9 for any negative queries? I want to forward our staff to an informational page if they were to visit a non existent domain. We have an internal ...
0
votes
0answers
5 views

How do I utilize hostnames on a local server? [migrated]

I'm familiar with buying hostnames/domains and vaguely familiar with DNS servers for resolving domains to IP addresses, but, for a home solution I know absolutely nothing. Let's say I want to host a ...
1
vote
1answer
22 views

IPv6 record will not take for rDNS

I added the following to named.conf zone "3IP6.A.B.C.ip6.arpa" { type master; file "3IP6.A.B.C.ip6.arpa"; allow-update { none; }; }; I then created my dns zone record called 3IP6.A.B.C.ip6.arpa ...
2
votes
2answers
80 views

Is IPv6 configuration important? [closed]

My website's server currently uses IPv4 only. I know IPv6 will be important in the future, but: Is it important to use IPv6 now? Does my website get less visitors if the server does not support ...
3
votes
2answers
37 views

Best CNAME TTL strategy for fallover switching

I've recently been thinking about the TTL of our DNS. We have A records for our servers and then CNAME records for the customer facing names. The www CNAME points to server-01 for example. In the ...
3
votes
5answers
903 views

Does HTTP get method rely on port 53 for DNS resolution?

I am reading about how DNS works in general and I stumbled across this question and answer. According to the accepted answer, the second step is when the DNS communicates with the ISP servers for ...
-1
votes
0answers
21 views

Can a URL redirect be created that points to an absolute URL? [closed]

I'm using DNSimple and they have a nice URL redirect feature that will create a URL record that will redirect a URL to another domain. URL example.com http://foo.bar.com URL ...
0
votes
1answer
62 views

How can I disable local mail delivery in Centos?

I want to disable local mail on my Centos VPS because the I have a web form (on a website which is hosted by the VPS) which is delivering mail to the local mailbox rather than looking at MX records to ...
0
votes
1answer
45 views

Website Contact Form stopped working when I moved mailserver [duplicate]

I have a Centos server with ZPanel Installed. This server is used for hosting a website. Previously, I hosted mail on this server using a "Roundcube" mailbox however, I moved to exchange therefore, I ...
2
votes
4answers
73 views

Multiple domains (with & without www prefix) on same server, running the same code

We've inherited the following website setup: one main website and around 130 secondary websites, which all point to the main website domain (through a CNAME DNS setup); Website is hosted on an IIS 6 ...
1
vote
1answer
46 views

Understanding apparent DNS changes between centos 6 and 7

I have a couple of test systems running Centos 6 and I thought I'd try out Centos 7. Apart from all the obvious differences (no iptables, no ifconfig), there is one thing that really had me scratching ...
-1
votes
1answer
45 views

Subdomain DNS appears to be resolving from different nameservers than main domain

I have an inexplicable issue with DNS for a domain and a subdomain. I first noticed that doing an A record lookup on the subdomain is returning different results than what is in the DNS config. Then I ...
1
vote
1answer
37 views

How to fallback to out-of-site login server - ActiveDirectory

I pretty much spend all of my time on Linux\Networking however I am trying to set up a multi-site AD configuration. There is no root site or anything like that, I simply have two DCs in SiteA and one ...
0
votes
1answer
62 views

how to create multiple sub domain in local host? [closed]

Using nginx and php I need to create multiple sub domain in local host. How i can make it happen? I am using ubuntu 12.04 andphp5 withnginx as webserver. i Have tried *.servername.com in my ...
-1
votes
1answer
30 views

How to check what application is requesting port? [duplicate]

Is it possible to check which application is requesting specific port in a debian server? I'm getting a ton of these in iptraf: x x UDP (77 bytes) from 172.16.0.2:25748 to 212.59.1.1:53 on eth0 ...
0
votes
0answers
64 views

bind “can't find example: SERVFAIL”

I'm trying to setup a dns server on my LAN because my router doesn't support nat reflection and I have virtualhosts which require a domain (can't be reached by IP address) running on apache. I'm not ...
-1
votes
0answers
16 views

DD-WRT to push alternate Name Servers to clients over DHCP [migrated]

In order for WiFi DHCP clients to use directly 8.8.8.8 and 8.8.4.4 as name servers, DD-WRT has been configured as follow add dhcp-option=6,8.8.8.8,8.8.4.4 in /etc/dnsmasq.conf (reboot) since that ...