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

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Why domain always puts port at the end of URL

I've got a box running on Nitrous.io that has a wordpress installation on it in the /workspace/www/ directory and in the box settings I've typed in my domain that I would like the box to resolve to in ...
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2 views

Ngrok custom hostname add cname to subdomain

I have xyzfoo.com domain. I created a DNS CNAME record which points to ngrok.com I have my app running locally on http://127.0.0.1:5000/ but not running remotely on zyxfoo.com Does a subdomain need ...
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1answer
25 views

Iptables block connection from specific IP - to another IP

sudo iptables -A OUTPUT -p udp -d 8.8.8.8 --dport 53 -j DROP This rule will block all DNS output from my server to Google dns 8.8.8.8 Is it possible to add a line that not all the traffic will get ...
2
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0answers
31 views

Multiple Domains Name on one server with Nginx

I'm struggling to configure two different domains name on my dedicated server... I've already one DN configured like this in the vhost DOMAIN_1.net.conf : server { listen 127.0.0.1:8080; ...
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0answers
15 views

Puppet Master attempts to resolve agent hostname

Running puppet agent -t from a non-dns resolvable client dumps out the following from a puppet master running in verbose mode: Error: Could not resolve 10.110.x.xx: no name for 10.110.x.xx (Where ...
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2answers
26 views

Does an MX DNS Record Sub-Domain need to exist as another DNS Record?

I am trying to setup a mail server on my Ubuntu server. In setting up the DNS MX Record for the mail server I am confused. I have added an MX record for mail.domain.com simply because it is the ...
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1answer
27 views

Clearing out Barracuda 310 web filter DNS/site cache?

On my network I have a Barracuda 310 web filter installed. After an issue with our ISP suddenly interrupting our DNS service, we switched over to a more reliable DNS on all of our systems. ...
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1answer
25 views

450 4.7.1 Client host rejected: cannot find your hostname

I have a Postfix/Dovecot email server which fails to deliver emails to some addresses. Here's an example of what is says: <xxxxx@board.com.ua>: host mail.da.net.ua[91.213.154.4] said: 450 4.7.1 ...
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0answers
4 views

cant ping specific device [migrated]

i have these nodes on the same network Sasmung GT-S5300 192.168.12.38 Asus Zenfone 5 192.168.12.37 pc(windows 7) 192.168.12.36 i tried to access my pc with my samsung through web browser, and ...
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12 views

Windows Azure linux domain

I've set up a Virtual Machine and I need to connect my domain .site.com to Windows Azure, I tried to do it with an A record using the provided IP, but the VIP address is not static, and after ...
-1
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0answers
25 views

dns config for nat with BIND [on hold]

Over the past days, i installed CentOS on a computer that I'm using to mess around with system admin related tasks. What im doing is, I'm basically making this computer into a "super router" as i like ...
2
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2answers
94 views

Changing an `A` record to a `CNAME` without downtime

I have a domain name (currently hosted on dyn.com) with an A record pointing to our production IP address. We're moving across to Amazon EC2 and are using a load balancer, with the recommendation ...
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votes
1answer
37 views

wrong info shown in intodns.com [on hold]

I have a web hosting website (the main domain is hosted on a cPanel server) I have set some DNS records for ns11, ns12.myhosting.com at both places possible: cPanel in Advanced DNS Zone Editor, and ...
-1
votes
1answer
36 views

Bypass primary DNS for one domain

I need to use my default DNS as primary, but for second I could use Google's one which is already updated. I would like to use Google's DNS for a specific domain which has changed IP and is still ...
2
votes
1answer
58 views

Is it possible to set a PTR record for Github Pages hosting?

Icelandic domains (.is) require that their domains support reverse DNS, which means configuring PTR records on the hosting server. Is it possible to set up a PTR record for GitHub Pages site hosting? ...
2
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0answers
46 views

Is it at all commonplace to make service available via the same host as its redundancy, just different ports? [on hold]

I am writing software that allows for the configuration of parameters for authentication with a Primary and Secondary RADIUS server. Server administrators, in your experience, is it common or not for ...
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0answers
33 views

Any suggestions on why DNS is failing over DrayTek 2820?

In recent weeks a weird problem has started in my office. The internet seems to stop working, but it has not failed, it's just DNS problems. Setup: ADSL2+ AnnexM connection via a Draytek Vigor 2820 ...
2
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1answer
92 views

named can not find a certain domain

I have setup named in chroot and it has been working for some days. Now it does not find a certain domain's IP: # dig arstechnica.com ; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.30.rc1.el6_6.1 ...
1
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0answers
17 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 ...
2
votes
1answer
29 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 ...
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4answers
314 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 ...
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2answers
65 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 ...
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0answers
13 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 ...
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0answers
23 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. ...
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28 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 ...
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1answer
17 views

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

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 ...
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0answers
69 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
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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 ...
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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 ...
-1
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1answer
18 views

Error Message from DnsResolver.pm after removing IPv6

After removing IPv6 (to get KVM working) from /etc/network/interfaces, I'm getting lately the following error: error creating a DNS resolver socket: Network is unreachable at ...
0
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1answer
23 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 ...
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0answers
16 views

Vestacp custome nameservers [closed]

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
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1answer
26 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 ...
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0answers
18 views

Setting up a windows server domain network and registration [closed]

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 ...
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0answers
33 views

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

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
51 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
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0answers
38 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 ...
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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
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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
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1answer
49 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 ...
2
votes
0answers
32 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
88 views

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

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
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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
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0answers
19 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 ...
0
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1answer
23 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
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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
304 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 ...
24
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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
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2answers
38 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
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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 ...