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• 4.5.1 4.4.0 DNS Query Failed

  - by Justin

  We are running Exchange 2010 and lately I have noticed that some outgoing messages get stuck in the queue with the error "451 4.4.0 DNS Query Failed". On every domain that this happens on I have been able to use nslookup to find the MX record and open a connection to their server over SMTP so I am reasonably sure that this problem is on my end. My send connector isn't routing mail through a smart host nor is is set to use a different DNS server to do the lookup so I'm stumped as to why these messages aren't going out. Any ideas?

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• Web server behind MikroTik and dynamic dns

  - by danielrvt

  I recently purchased a MikroTik router, it works great! However, I haven't been able to make my web server work from outside my lan I'll explain better: I have two domains in my disposal, before I switched to Mikrotik, the were working perfectly and all my websites were online. Since I changed the router, every time I try to access my websites from outside my lan, my websites can't be found. I have my websites domains associated with a dynamic dns provider, I managed to create a port forwarding rule to redirect all my incoming traffic from port 80 to my web server, and it works, but only when I'm connected to my MikroTik router. Is there something else I have to do? PD: I also created a static dns rule in my router with my domains to associate it to my webserver (which is behind my router) PD2: All I want is to redirect requests from outside to my webserver...

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• Dynamic DNS with Comcast

  - by colithium

  I've just recently moved across town. Previously, I had Dynamic DNS set up so I could remotely connect to my desktop (primarily to use TightVNC). My ISP was Comcast and I'm in the Denver, Colorado area. Currently, I'm still with Comcast and still in Denver. My router connects to the internet just fine and my Dynamic DNS record over at DynDNS did get updated with my router's current external IP address. So my router, DynDNS, and public DNS records all agree what my IP address is. However, I can't actually connect to anything from the outside world. My trace route to Google looks something like: Tracing route to google.com [74.125.19.147] 1 3 ms 1 ms 1 ms 192.168.1.1 (this is the internal IP address of my router) 2 * * * Request timed out. 3 9 ms 8 ms 10 ms te-8-2-ur02.wheatridge.co.denver.comcast.net [68.85.221.177] 4 12 ms 12 ms 19 ms te-0-8-0-2-ar02.aurora.co.denver.comcast.net [68.86.103.97] 5 16 ms 13 ms 11 ms pos-0-3-0-0-cr01.denver.co.ibone.comcast.net [68.86.91.1] 6 28 ms 28 ms 27 ms pos-0-9-0-0-cr01.dallas.tx.ibone.comcast.net [68.86.85.174] 7 29 ms 27 ms 28 ms pos-0-1-0-0-pe01.1950stemmons.tx.ibone.comcast.net [68.86.86.94] 8 66 ms 108 ms * 75.149.231.70 9 65 ms 68 ms 93 ms 72.14.233.77 10 67 ms 66 ms 66 ms 72.14.233.111 11 67 ms 67 ms 69 ms 216.239.43.144 12 68 ms 71 ms 73 ms 209.85.249.30 13 66 ms 66 ms 68 ms nuq04s01-in-f147.1e100.net [74.125.19.147] This is what the trace route looks like from an outside source to my DynDNS domain name: traceroute to 98.245.67.65 (98.245.67.65) 1 illuminati-130 138.67.130.61 2 138.67.63.253 138.67.63.253 3 vermiculite 138.67.253.20 4 csm-ct-gw 138.67.253.244 5 138.67.253.2 138.67.253.2 6 ge-7-24-ar01.denver.co.denver.comcast.net 68.86.128.17 7 te-0-4-0-0-ar02.denver.co.denver.comcast.net 68.86.179.21 8 te-9-3-ur01.wheatridge.co.denver.comcast.net 68.86.103.18 9 * * * {Times Out} Now my guess is, whatever is sitting just beyond my router (what the modem connects to) is gumming things up. Even though the routes aren't EXACTLY the same, that appears to be the spot that the trace route either stops or doesn't get a response. My question is, for Comcast networks (particularly in Denver), what would be the device that typically sits there? Is there anything I can do about it? That device seems to not respond to PING but does forward it along when I'm going outwards. But it looks like it eats it when the request is coming in. It's hard to prove that from these logs but I'm assuming that's the case because my router used to accept connections from the outside and I haven't changed anything on it.

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• DNS Help (CNAMEs and A Records)

  - by Aaron Francis

  I'm trying to set up my DNS properly so that I can have hosting through PHPFog and email services using MailGun. PHPFog has us redirect the naked domain to the www and then use a CNAME to point the www to PHPFog and mailgun provides the MX records to use. The problem I'm having is that I have no A record set up on Hover because when I do, the CNAME no longer works (?), or at least it seems that way because I am no longer seeing my site from PHPFog, I'm seeing a Hover landing page. I know all the records I need, I just can't seem to get them to play nicely together. I've been told Amazon's Route 53 should be able to solve my problem, but I haven't yet figured out how. I just need to have hosting at PHPFog and email services through MailGun. As you can probably tell, I have only a very limited understanding of DNS, so forgive me if this is a silly question.

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• redirect traffic to www.example.com through DNS from example.com

  - by ChrisMuench

  Hello, I have a bit of a unique problem. for the domain (example.com) I want people to go to www.example.com however I'm also throwing GSLB into the mix. for GSLB the devices(one in each datacenter) need to be the nameserver for portion of the domain that they are going to answer for(www.example.com) so I know I can make the NS record of www.example.com just fine and have it point to each GSLB device. However that only helps for www.example.com NOT example.com. I don't want to make my root NS of example.com my GSLB as my enterprise managed DNS provider does an excellent job of all DNS stuff. any ideas?

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• Wrong DNS query in Active directory network with NetBIOS enabled client

  - by koankoder

  The setup: Active Directory is enabled on the network (abcd.com) We have a single character host name (1.abcd.com) one of the desktop has an old XP with NetBIOS stuff enabled The Problem Whenever we query for any host name from the XP machine, the first character alone is taken for DNS query (one.abcd.com will query for o.abcd.com, two.abcd.com will query for t.abcd.com) Even if we give some IP, the application queries with numeric prefix (10.x.x.x will query for 1.abcd.com).Since we already have 1.abcd.com, all query and traffic ends up in 1.abcd.com After discussion with network guys, it seems netbios DNS queries by having some prefix etc. but none of them is actually sure on what is happening. Is there any docs which can explain this behavior ? Is this valid behavior in NetBIOS environment ?

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• Transition domain to new web host without waiting for DNS propagation

  - by jcmoney

  I was considering switching to Amazon EC2 to host my website to handle more traffic. It seems like I would have to update DNS records to point to the new server but I was wondering if there was a way to avoid having to wait for the new DNS record to propagate. Putting the code on both hosts would not work for me since the app writes to a database pretty frequently. I thought about just using a meta redirect or php redirect on the old host to redirect to the new host ip but was wondering if there's a better more accepted way of doing this.

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• Setting up Dynamic DNS for Wireless Cameras And Accessing them Remotely

  - by Mike Szp.

  I've been trying to set up two TP LINK wireless N cameras that I bought so that I can see them remotely. I've set it up so that each has it's own ip address (192...105/192...106) and I can access them if I type that into the browser of a local computer The thing is that I don't know how to access them from another remote PC. My current setup is a a each camera connected to the router which then connects to the modem. When I set up the Dynamic DNS, and I access the "webpage" for my IP through a remote computer, it just goes to the configuration page of the modem. I have no idea how to make it go to the router or to the cameras. the router has its own ip range of 192.168.1.x while the modem has 192.168.2.x To access the cameras I type into the web browser: 192.168.1.114:100 on the local computer but I have no idea how to get there through the webpage of my Dynamic DNS remotely.

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• Apache disable DNS lookups

  - by odeceixe

  I'm using Debian 4.3.2-1 and Apache 2 on my production server. Watching the logs, I noticed Apache is resolving client's hostnames even with HostnameLookups Off in apache2.conf. I want to avoid these lookups so I'm guessing Apache is making this DNS query because I have mod_authz_host enabled. When I try to unlink this module, I get several modules complaining because they use the Order directive. How is the clean way to go? Should I comment all Order directives like Order allow,deny Deny from all Is this the only way to stop Apache from making DNS requests? I would like to deny access to .htaccess files and some rules like that.

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• Bonjour/DNS Service Discovery queries

  - by senloe

  I'm trying to implement dns service discovery in my application (no, I'm not asking for a programmatic answer). What I believe is one of my big pain points is generating the query. I know I need to send out a multicast broadcast on port 5353 and want to look for devices of type _ipp._tcp and _print._tcp, but I don't know what the question section needs to look like. For example, in SSDP I sent out a query that looks like the following: "M-SEARCH * HTTP/1.1\r\n" "HOST: 239.255.255.250:1900\r\n" + "MAN: \"ssdp:discover\"\r\n" "ST: urn:schemas-upnp-org:device:Printer:1\r\n" "MX: 5000\r\n\r\n" From what I know about a DNS query I need to send something like: "_ipp.tcp,all,all" but I know there needs to be more. Any pointers to documentation, etc would be greatly appreciated! update rfc1035 appears to contain promising information re the message structure.

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• DNS management for WHMCS / cPanel?

  - by RD.

  I currently have WHMCS (www.whmcs.com) that I use for the billing system for my hosting company. It integrates with cPanel and WHM. I want to be able to allow clients to: Change MX Records Change DNS info (CNAME, A Record etc) 1 can be done in cPanel. But 2 not. So my questions are: 1. Is there a program/application available that will give clients access to this? I.e. So they can change their DNS info? 2. How do other companies do it?

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• Change default DNS server in Arch Linux

  - by AntoineG

  I'm in Viet Nam and most social websites (Facebook, Twitter and the likes - even reddit) are blocked by the ISP DNS server. I tried to change the DNS server of my Arch box using the resolv.conf file, but it failed miserably since dhcpd generates this file automatically everytime I connect to the LAN. I've been looking around to try and find out how to fix this, without success. Either I s*ck at Googling, either it is non-trivial to do so. EDIT 1: Meh, apparently posting it here made me feel guilty and I had to push my search a bit more. I found the same article than Ankur post below. This is what I made, if anybody ever faces the same problem: $ sudo gvim /etc/dhcpcd.conf Add "nohook resolv.conf" at the tail of the file. $ sudo gvim /etc/resolv.conf Add to the file (OpenDNS servers): nameserver 208.67.222.222 nameserver 208.67.220.220 Or (Google DNS): nameserver 8.8.8.8 nameserver 8.8.4.4 Then, verify it worked (need package dnsutils): $ dig www.facebook.com ; <<>> DiG 9.9.1-P1 <<>> www.facebook.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 16994 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;www.facebook.com. IN A ;; ANSWER SECTION: www.facebook.com. 89 IN A 69.171.224.53 ;; Query time: 87 msec ;; SERVER: 208.67.222.222#53(208.67.222.222) ;; WHEN: Thu Jun 28 00:43:23 2012 ;; MSG SIZE rcvd: 61 See ;; SERVER: 208.67.222.222#53(208.67.222.222), it worked.

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• DNS: domain2 points to domain1

  - by Yar

  I have one domain ("domain1") that is set up with hosting and mail (hosted by Gmail Apps). This domain works perfectly. I want a second domain ("domain2") to forward to domain1, but I don't want to use "DNS Forwarding." I would like to have it act EXACTLY like domain1, so that domain2/whatever points to the same resource as domain1/whatever WITHOUT AN HTTP REDIRECT NOR BROWSER TRICKS LIKE FRAMES. I would also love to be able to send mail to "blah@domain2" and have it go to "blah@domain1". Can this be set up, and how? I am using GoDaddy as registrar and DNS host for both domains. GoDaddy is also the web host for domain1, and mail hosting is with Google Apps.

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• Linux (Kubuntu 9.10): Strange DNS problem [seems to be IPv6 issue]

  - by Homer J. Simpson

  Hi, I'm experiencing strange problems with my Kubuntu 9.10 when doing DNS requests from various applications. The requests are extremely slow, so loading any pages in Firefox or Konqueror, doing package installations in Kpackagemanager and other apps is really painful, while for example Opera doesnt have any problems, and ping is normally fast as well for DNS pings. I checked the proxy settings of both the used applications as well as of the general system and there are none, so to me it doesn't seem as there was something inbetween.. Does anybody have an idea on what to check for possible problem sources or how to solve this ? I'm behind a DSL home router which does the DHCP (and works well with my other computer). Any kind of advice would be really helpful. Edit: It seems to be some kind of IPv6 problem, as I could get it to work by disabling IPv6 explicitly in Firefox. Is there a general solution to this ?

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• Setup a DNS wilcard and MX record in the same zone

  - by Nicolas BADIA

  I'd like to know how to configure my DNS to be able to use a wildcard for my domain and an MX record together. Here is what I've done: @ IN SOA dns100.ovh.net. tech.ovh.net. (2012052100 86400 3600 3600000 300) IN NS ns100.ovh.net. IN NS dns100.ovh.net. IN MX 1 mail.gestixi.com. IN A 91.121.39.211 * IN CNAME gestixi.com. www IN CNAME gestixi.com. The problem is that when I check my DNS, I get this error: MX records shall not point to an alias defined by a CNAME Because of this error, it look like I can't send mails from some internet providers.

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• DNS responding only to nslookup in Windows 7

  - by DeeJay1

  Hello. I have an interesting DNS issue in AD (2008R2) which I can't find a way to debug. Mainly if from commandline I try ping <machinename> then I get the reply that the hostr isn't found. But when I do nslookup <machinename> I get the correct response from my DNS with proper AAAA and A records. Anyone has an idea what could cause this? The client machines run Windows 7 Enterprise.

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• /etc/hosts file setting for no dns lookup

  - by vinayrks

  Can you explain me what I need to add in my hosts file for no dns look up

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• How to use private DNS to map private IP with "non registred" domain name

  - by PapelPincel

  I would like to use a private DNS (Route53 in our case) in order to map hosts to EC2 instance private IP addresse. The hosted zone we are using for testing is not declared in any registrar (company-test.com.). There are different servers (Nagios, Puppet, ActiveMQ ...) all hosted in ec2, that means their IP can change over time (restart, new instance launch...). That would be great if I can use DNS instead of clients' /etc/hosts for mapping private IP/internal domain name... The ActiveMQ server url is activemq.company-test.com and it maps to (A record) private IP address of the AMQ server. This url is only reachable by other ec2 owned by the same aws account. My question is how to configure ec2 instances so they could reach the ActiveMQ server WITHOUT having to buy a new domain company-test.com ?

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• Does Dynamic DNS require separate subdomains?

  - by kce

  Hello. I have a functioning DHCP/DNS (ISC Bind 9.6, DHCP 3.1.1) server running on Debian that I would like to add DynamicDNS functionality to. I have a pretty simple question: Does DynamicDNS require (or recommend) separate sub-domains? I have seen a few tutorials where the the clients that are acquiring their IP addresses and other networking information via DHCP are on a different sub-domain as the servers which are statically configured (both in terms of IP, and DNS). For example: All the clients are on ws.example.org and the servers on example.org. Right now all of our servers and clients are in the same domain (example.org) but spread across different zone files (because we have multiple subnets). The clients are configured with DHCP and the servers are configured statically. If I want to setup DynamicDNS for the clients should I use a separate sub-domain? What's the best practice here (and why or why not would it be a bad idea to do otherwise)? Thanks.

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• Send additional records in DNS response

  - by Joel

  Is is possible to send one or more additional records with a DNS response? For example, can a request for the A record of www.example.com result in a response containing the A record for www.example.com as well as the A record for www2.example.com? Is this compliant with the standard? Will it even help? ie. Will the typical client cache the additional record so that when it needs it in the near future, it won't result in another round-trip to the DNS server?

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• Inconsistent DNS report results on different websites

  - by Saif Bechan

  I am checking my server dns setting on different websites. intodns,dnssy,dnscog, but on all the websites i get different results. Some say my mail server settings are not good, some say i have no A records for my NS records. Only on dnssy everything looks to be ok. Should i just trust the website with the best results, or what should i do? How does this sort of inconsistency occur in the first place. I am new to servers and dns, and this makes it very misleading.

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• SBS 2008 DNS issues in BPA

  - by evesirim

  I'm gettng constant Critical Issue events in the Small Business Server Best Practices Analyser & resulting SBS Console reports that begin "The DNS client is not configured to point only to the internal IP address of the server.". When I check the DNS Manager, there are two separate IPs listed, one ***.***.***.2 and the other ***.***.***.28. I have checked online after an ipconfig /all and have found the reason for this to be that the second IP is created by DHCP for RAS & VPN purposes. It seems to cause no conflicts of any detrimental result apart from constantly sending me error messages and alerted reports. Does anyone know of a way that I can change settings somewhere so that Windows accepts this second IP, or at least stops alerting me of its prescence? Perhaps a registry hack of some kind...? Many thanks in advance

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• Windows cannot find the host name "download.microsoft.com" using DNS

  - by joedotnot

  When trying to download a file found on the Microsoft downloads center that starts with, for example, http://download.microsoft.com/download/6/8/7/(some_GUID)/(some_file_name.ext) i get a timeout with "Internet Explorer cannot display the webpage". More information says: Internet connectivity has been lost. The website is temporarily unavailable. The Domain Name Server (DNS) is not reachable. The Domain Name Server (DNS) does not have a listing for the website's domain. If this is an HTTPS (secure) address, click Tools, click Internet Options, click Advanced, and check to be sure the SSL and TLS protocols are enabled under the security section. Diagnose Connection problems says: Windows cannot find the host name "download.microsoft.com" using DNS Bear with me while i expand on the problem: It all started when i tried to download Windows XP mode for my Windows 7 machine. I went to the virtual PC site, then thru the motions of Windows Genuine Advantage which validated ok, but when it redirects to grab the file just times out with above error. (NB: i also tried with the latest Chrome and Firefox but no use due to the Genuine Advantage stuff, so i decided to stick with IE). I am behind an ADSL2+ modem router connecting via wireless (Win 7 Pro laptop); so i hop over to the desktop connected via ethernet (Vista Business), and same result; begin to think site download.microsoft.com site is down. So i give it a break an read up on EDNS, flushing the cache, hosts file, etc... Try again an hour later on the Win 7 machine, still no go; so i turn off the Win 7 (software) firewall, and lo and behold, i can connect and grab any files from download.microsoft.com; (...nice, so we have a Micro$0ft firewall preventing access to a Micro$0ft website, no wonder my auto-updates kept failing but that's another story). But i still am not happy that the desktop connected via ethernet still cannot get to download.microsoft.com, even though i turned off all firewalls, defenders, anti-virus, etc. What is so special / specific about the url download.microsoft.com, any other site is ok, including www.microsoft.com. Any networking guru know what's REALLY going on, and how can i get the desktop to connect? Ping download.microsoft.com - Ping request could not find host download.microsoft.com. Please check the name and try again. Ping google.com or even www.microsoft.com works gives me an IP address. NB: On the wireless laptop ping download.microsoft.com works, i get xxxx.ms.akamai.net [202.7.177.33].

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• Strange DNS problem [seems to be IPv6 issue]

  - by Homer J. Simpson

  Hi, I'm experiencing strange problems with my Kubuntu 9.10 when doing DNS requests from various applications. The requests are extremely slow, so loading any pages in Firefox or Konqueror, doing package installations in Kpackagemanager and other apps is really painful, while for example Opera doesnt have any problems, and ping is normally fast as well for DNS pings. I checked the proxy settings of both the used applications as well as of the general system and there are none, so to me it doesn't seem as there was something inbetween.. Does anybody have an idea on what to check for possible problem sources or how to solve this ? I'm behind a DSL home router which does the DHCP (and works well with my other computer). Any kind of advice would be really helpful. Edit: It seems to be some kind of IPv6 problem, as I could get it to work by disabling IPv6 explicitly in Firefox. Is there a general solution to this ?

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• Setting up a router as a DNS server only

  - by Jacob R

  I have a Linksys WRT54GL router that I don't need anymore, since I had to buy a 3G capable router (Dovado 3GN). As I only have a 3G connection at home, I want to optimize it as much as possible. I want to setup a caching DNS server, including some blacklisting of ad domains. The router currently runs the DD-WRT firmware. Is it possible to use this router as an ordinary computer, running only a DNS server, disabling all other features such as DHCP, WLAN, etc? Connecting it to my other router, should I simply run a cable into the WAN-port of the Linksys router?

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