I have had an Umbraco install running on EC2.

Everything is working well, but once every few hours the server given a status of 500 with the error:

The requested name is valid, but no data of the requested type was found

The call stack shows an error is resolving DNS inside the client dependancy framework.

SocketException (0x2afc): The requested name is valid, but no data of the requested type was found]
   System.Net.Dns.InternalGetHostByName(String hostName, Boolean includeIPv6) +7987115
   System.Net.Dns.GetHostAddresses(String hostNameOrAddress) +544
   ClientDependency.Core.UriExtensions.IsLocalUri(Uri uri) +184
   ClientDependency.Core.Module.<>c__DisplayClass2.<ReplaceContent>b__1(Match m) +337
   System.Text.RegularExpressions.RegexReplacement.Replace(MatchEvaluator evaluator, Regex regex, String input, Int32 count, Int32 startat) +302
   System.Text.RegularExpressions.Regex.Replace(String input, MatchEvaluator evaluator) +68
   ClientDependency.Core.Module.RogueFileFilter.ReplaceContent(String html, String namedGroup, String[] extensions, ClientDependencyType type, String regex) +147
   ClientDependency.Core.Module.RogueFileFilter.UpdateOutputHtml(String html) +240
   ClientDependency.Core.Module.ResponseFilterStream.OnTransformCompleteStringInternal(MemoryStream ms) +212
   ClientDependency.Core.Module.ResponseFilterStream.Flush() +106
   System.Web.HttpWriter.FilterIntegrated(Boolean finalFiltering, IIS7WorkerRequest wr) +603
   System.Web.HttpResponse.FilterOutput() +121
   System.Web.CallFilterExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +168
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +270

Has anyone seen this error before?

I had the site hosted @ GoDaddy for a year and have never seen this error.

Thanks!