Skip to main content

Windows Server 2008 R2 DNS issues

This week we stumbled upon some weirdness in our new 2008 R2 DNS servers. A couple of URLs, for example www.smhi.se and www.stockholm.se could not be resolved from a 2008 R2 server. The existing 2003 servers with the same configuration worked perfectly.

After thorough troubleshooting we found out that there is a new default setting in Windows Server 2008 R2 regarding the EDNS-protocol that caused the issues. Not all of the DNS servers around the internet are able to handle EDNS, but in 2008 R2 this protocol is enabled by default. Normally you would think there is a fallback mechanism to standard DNS protocol if an EDNS request fails, but Windows Server does not have that.

The solution was simply to disable EDNS by using the command: dnscmd /config /EnableEDNSProbes 0

Scott Forsyth has written more about this issue and how he found the solution:
http://weblogs.asp.net/owscott/archive/2009/09/15/windows-server-2008-r2-dns-issues.aspx
Labels:

Comments

Post a Comment

Popular posts from this blog

LEAP Sweden - Identity & Access Management

Today was the third day of the Swedish Lead Enterprise Architect Program at Microsoft in Kista. It has been a day filled with sessions on security and identity with a kind of unavoidable focus on federated identities in the cloud. Overall it has been an awesome day with seminars from Henrik Nilsson , Barry O'Reilly and Sergio Molero among others. A lot of Microsoft technologies was mentioned, Forefront Identity Manager , Active Directory Federation Services 2.0 , Forefront Unified Access Gateway , Direct Access ,  Windows Identity Framework and of course  Azure Access Control Service . Microsoft really has a great suite of applications regarding Identity & Access Management. I just wish there was a project or two where I could utilize all of these amazing technologies. I have had a plan to add a login feature to the Cornball using federated identities, so that might happen in the near future. Besides, Björn Eriksen provided a tip for all of us thursty for e...
1 comment
Read more

The Cornball goes to Brunch with Chaplin

Lately I've been working pretty hard on different projects but not really stumbling upon anything blogworthy. The most recent project is quite interesting though, a single page, touch friendly, web application using the latest and greatest technologies. We've ended up with using Brunch with Chaplin , which is a very neat way of setting up a Backbone based single page web project with Brunch and Chaplin . Aside from this, I have my own little project that has lived on for almost 15 years already, The Cornball . From being a plain Windows application written i C an Win32 API, it has been ported to .NET using WPF, and is currently a Silverlight application hosted on Windows Azure. I could not find a better time to reanimate this project and create a new web based version, touch friendly, super optimized, awesome in any way. So I did... So please follow my journey at Github . It's going to take a while, I assure you, but I already have some ground work done. Meanwhile,...
3 comments
Read more

Using ASP.NET MVC with MEF

I wrote this post almost a year ago, but never published it for some reason. Anyway, here is a little MVC/MEF magic. By default a controller in MVC must have a parameterless constructor. When using MEF a good practice is to inject the services via constructor parameters. These two in combination obviously creates an issue where the following scenario will not work out of the box, since there is no parameterless constructor for  MVC  to use. Note that the PartCreationPolicy is set to NonShared since a new controller have to be initialized for each request. [Export] [PartCreationPolicy(CreationPolicy.NonShared)] public class HomeController : Controller {     private readonly IServiceClient _service;     [ImportingConstructor]     public HomeController(IServiceClient service)     {         _service = service;     }     public ActionResult Index()     {         ...
2 comments
Read more