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

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Multiple DNS mappings for a host via DDNS

I have a network in which DNS is automatically updated with a record for hosts when they get an address via DHCP (isc-dhcp-server & Bind configured with DDNS updates). The DHCP server is ...
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517 views

Setting up DNS server to accept dynamic updates without FQDN

I have set up a Win2k8 R2 server with the DNS role enabled. I had to add the server to a fictional workgroup/domain called dns.com so as to be able to use it as a primary DNS server to my network of ...
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899 views

DNS Zone Transfer to secondary - not authoritative

I Current have a small windows 2008 AD Domain, as well as 2 completely different forests and subnets. Each with its own unique domain running windows 2003 domains. All subnets are properly routed via ...
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88 views

Strange DNS behaviour over VPN

We have a small branch with few computers with few computers connected via the Internet to our central building. We don't use site-to-site, but dial-in to the Cisco router (we use ShrewSoft as a ...
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61 views

Exchange 2007 to Exchange 2010 Migration - Message flow problems

I've tried to migrate an exchange server 2007 to the newer 2010 on another server. I have installed the 2010 roles one after another (CAS -> Hub Transport -> Mailbox). After installing each of these ...
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56 views

Replacing SBS 2008 DC with a Win 2008R2 DC

Objective : Replace a SBS 2008 with a Win 2008 R2 on or Domain and migrate Exchange 2010 to the new server. Steps taken: The following steps were taken - Technet , serverfault. All the replication ...
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271 views

Problems setting up active directory

I just installed Windows Server 2012 onto my server and proceeded to install AD DS. And after days of trying, we just can not get Active directory to work! I installed everything the same way I did ...
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289 views

Mail stuck in queue folder using IIS 6.0 SMTP server

I have finished setting up my server but when I sent email it got stuck in queue folder. This was a test email which I put in pickup folder. So I checked my log file. I have pasted the log files ...
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114 views

Bind9: Resolve internally then externally

My DNS is running in a split DNS scenario. Both publically and internally we have the same domain. Lets call it test.com When an internal user goes to test.com they get a different response to the ...
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26 views

openvpn client.up script erroring out

I'm using OpenVPN 2.2 on Ubuntu 12.04 and I'm having a little trouble getting "pull dhcp-options" working. I have client.up and client.down under /etc/openvpn/, and I can see it running client.up, ...
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248 views

Bind with openDNS forwarder fails to resolve some local domains

I have a local DNS server set up for my network, which is set up to resolve local machines and forward anything non-local up the chain. Some of the definitions single depth subdomains, e.g. time ...
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99 views

Websites (IIS 7.0) unavailable from Internet upon rebooting 1 out of 4 DCs

What happened: We had to reboot one of our Domain Controller (DC), located on the VLAN 1 for maintenance purpose. We have a total of 4 DCs on 3 VLANs, so we thought that wouldn't affect our ...
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68 views

DNS record not added when server joins domain

I've brought up three Windows 2012 VMs inside of an OpenStack cloud. I configured the first one as a domain controller, named "dc" (domain: internal.lorinhochstein.org), and then I joined the other ...
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413 views

DNS Server using bind on CentOS - does not resolve

I am trying to setup a DNS for a standard lan zone. I have now read every bit of info available but still the DNS server does not resolve with nslookup or dig e.g. "nslookup router.local.lan" => ** ...
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107 views

Set Azure websites to wildcard

I am trying to configure wildcard (*.) to azure websites, I followed the following tutorial: https://www.windowsazure.com/en-us/develop/net/common-tasks/custom-dns-web-site/ And i have managed to ...
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450 views

Some workstations/servers on the domain respond with IPv6 instead of IPv4 addresses, even though IPv6 is disabled across the board

Earlier this week I've noticed some issues on my network. For example when I ping my machine (from my machine) using the hostname (or FQDN), I see a response from an IPv6 address. ...
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218 views

Potential Microsoft DNS server cache corruption?

I'm in an enterprise environment that has 2 Windows 2008 R2 domain controllers running in native 2008 R2 mode. On these DCs, the DNS service is installed and all Windows (XP,7) clients (~2,000) are ...
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65 views

Apache DNS forwarding is finally working but some domains are resolving to the VPS IP address

I have a Linode VPS and 1&1 has my domains. I've finally got all of my web addresses pointing to my server and displaying the proper content but only one of my three domains is keeping its web ...
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431 views

Server getting constant DNS TXT queries - What is the hazard potential?

recently I discovered that my server was generating a lot more traffic than normal. Normally I get around 1-10 Mb per day, since the server only works as a host for eMail and static websites. ...
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129 views

Running a VPN server and a captive portal on the same machine with a DNS too

I don't know if this can be done but I'm asking anyways. Let's say that I've an Ubuntu machine with OpenSwan and xl2ptd to handle incoming VPN connections. Now, what I need to do is something like ...
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71 views

Azure Websites WAWS and several subdomains

I have a website mysite.azurewebsites.net and a domain mydomain.com Linking mydomain.com to the website succeded. I added a DNS entry A record and the awverify.mydomain.com CNAME to ...
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88 views

Shares disappear on Windows 8 while logged in with admin account

Shares setup on Windows 2008 R2 with AD and OU's have been working and still work on Windows 7 on a Domain. I have 2 shares that work with normal domain accounts on Windows 8 pro but as soon as you ...
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165 views

Windows Server 2008 DNS server CNAME resolution and TTLs

We have a Windows 2008 SP2 DNS server configured to use root hints. We have a certain MX record lookup that it periodically fails to resolve for our client machines. The lookup is for the MX record ...
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365 views

NETLOGON Warning Event ID 5781

I have Server 2003 SP2 Standard Edition. This past week it has been logging an event called NETLOGON Warning 5781 at various times of the day. When this happens client computers lose access to the AD ...
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403 views

How does one configure UFW to allow private DNS requests, but block DNS requests from internet

I have an Ubuntu Server 12.04, with two network cards: eth0 is connected to the internet eth1 is connected to a private network (192.168.10.1) The server is configured as a gateway and hosts DNS ...
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44 views

How to assign unique external IP addresses to each domain virtual host

My hosting provider gave me bunch of external IP addresses and its internal IP addresses assigned to each external IP. I was able to assign Main IP address and the second one but rest of them does ...
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893 views

BIND - connection timed out; no servers could be reached - default query to a domain

I have a bind server which, when you query it this way (from localhost, obviously) : host nomachinehasthisname 127.0.0.1 replies : ;; connection timed out; no servers could be reached It throws ...
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128 views

SBS 2011: unable to access remote.mydomain.com/myapp after moving from internal to external network

I have a secure site setup at remote.mydomain.com, and a webapp at remote.mydomain.com/myapp Both internal and external clients can access these sites no problem. However, when a laptop user that can ...
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545 views

Any way from a command line to change the DNS suffix of a Win7 PC?

I need to change the DNS suffix on Win7 PC's. Netsh does lots, but I can't find this in there. Any way to change it in a batch file (such as a logon script)?
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75 views

Gradually moving services from one server to another using Plesk DNS

I'm starting a gradual process of moving from one VPS on one ISP to another VPS on another ISP and I have some questions about DNS settings. The long term goal is to eventually be completely shut of ...
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207 views

dnsmasq and openvpn, server resolving different IPs based on client network

Long time lurker, first time poster - here it goes: We've got an office server running Debian 6. It's used as a smb file server, ssh server, openvpn server, dns and dhcp server (via dnsmasq). The smb ...
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109 views

DNS lookup failure while configuration is okay

I have configured my DNS using OpenPanel and it didn't report any errors. It just adds a DNS config file which is included /etc/bind/named.conf. When I do named-checkconf /etc/bind/named.conf ...
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1k views

Unable to Mange DNS via MMC

When trying to access the DNS service on Microsoft Windows Server 2003 (Build 3790) domain controller/schema master via the MMC DNS snap in or locally via the DNS MMC from Administrative tools I'm ...
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965 views

MX records not working on Amazon route 53

I have configured my Amazon route 53 DNS to add the google apps MX records and here is how my route 53 configuration looks like (please ignore the upper red box in the photo) : However, these MX ...
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193 views

dnsextd connection to server error

How can I correct these dnsextd errors in my system error log? dnsextd keeps starting and restarting via lanchd. Can I disable dnsextd via command line? dnsextd ConnectToServer: connect - Socket is ...
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46 views

Issue with domain redirection

I have a flash games website which is hosted at godaddy server. But because of heavy traffic on my site the godaddy server gets down. So I changed the hosting to Midphase server. The strange thing is ...
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122 views

OARC's DNSSEC validating resolvers validate all my records but A records

I have DNS set up with powerdns. It serves my DNS pretty well, and it AXFRs to other slaves. The slaves haven't yet updated to the most recent records, but that doesn't affect the validation, it would ...
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1k views

vmware DNS in host-only configuration

I want to connect a Linux VM running in VMWare on a Windows 7 laptop to an enterprise network using host-only configuration. I was able to setup bidirectional routing between "host-only" VMWare ...
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118 views

How to breakout Reverse DNS Zones

I've inherited a Windows network with Windows server based DNS and there are issues, such as not being able to update PTR records, etc. So, I am at a branch office with our own AD domain and DNS on ...
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42 views

Which address should clients use for e-mail server to ensure SSL encryption?

Currently we keep a DNS rule for every client that has mail.domain.com and this helps us redirect their mail to another server like GMail if they don't want to use our server. The problem is that when ...
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59 views

DNS responses received by server 2008 but nothing is resolving - Site to Site VPN

So, I have a Site to Site VPN from my Main office (192.168.0.x - Cincinnati) to my branch office (192.168.1.x - Chicago). I was having some issues that prompted me to add domain controller at ...
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60 views

Windows Server 2008 DNS stops working after power loss

I have about 10 WinVista/Win7 PCs connected to a standard Windows Server 2008 box. In the last 2 weeks, I've had power losses. Each time, all the PCs that use the Windows Server for DNS get ...
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128 views

Downtime pattern with Azure WebSites and DNS

Call me an early adopter, but I recently migrated my web service over from an Azure web-role to a "Reserved instance" on their new web sites service (mainly for git deploy!). The migration went ...
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90 views

dns configuration ubuntu server

how to make zone files auto updated? I mean It should add clients' computers' names. but it doesn't happend. even more - client can't ping itself with domain name. and nslookup for either 192.168.1.10 ...
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436 views

No names resolve in new BIND installation - wondering if issue is that BIND cannot resolve the NS

When I configure a new domain using Webmin/BIND, I am asked for a Master Server. Webmin fills this value automatically with the hostname of my box. However, this hostname is made up and there is no ...
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193 views

Attempting to DNS resolve / relay an IPv6 address for a host

I have a network switch doing IPv6 DNS relay to a Linux box (3.0.4-gentoo #7). The packets (DNS request) are arriving fine at the Linux box. Where I'm stuck now is how to resolve those, either by ...
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588 views

Fedora join to AD DS (svr 2008): NT_STATUS_INVALID_COMPUTER_NAME

I have been attempting to join my Fedora machine to my 2008 AD DS domain (testdomain.lcl) for some time now. I have followed this article: http://weblog.bignerdranch.com/?p=6 But with no luck. I ...
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119 views

Problems with virtual eth interfaces on an Mac 10.6 OD Master

I've been trying to setup multiple virtual interfaces (virtual ethernet ports) on a 10.6.8 OS X Server - this server is our Open Directory master. I want to set up additional IPs on the server because ...
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291 views

Windows DNS Server Not Responding To Postini Cluster

First, a sordid story: My DNS server, for historical reasons, uses the Plesk Control Panel. I plan on migrating all of that server's duties to a new Windows server, without Plesk, so I told Plesk to ...
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573 views

How to host multiple websites on one shared server account

I'm using shared hosting on which I host a website and have got some "parked domains" (they show the same content as the master domain). I'd now like to catch those domains and show different content, ...