Tuesday, September 14, 2010

If you hit a problem with ConfigMonitoringPoll - Polling for configuration changes - when using Azure Diagnostics

Reported as:
Polling for configuration changes:Microsoft.WindowsAzure.StorageClient.StorageClientException: The specified blob does not exist. ---> System.Net.WebException: The remote server returned an error: (404) Not Found. at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult) at Microsoft.WindowsAzure.StorageClient.EventHelper.ProcessWebResponse(WebRequest req, IAsyncResult asyncResult, EventHandler`1 handler, Object sender) --- End of inner exception stack trace --- at Microsoft.WindowsAzure.StorageClient.Tasks.Task`1.get_Result() at Microsoft.WindowsAzure.StorageClient.Tasks.Task`1.ExecuteAndWait() at Microsoft.WindowsAzure.StorageClient.CloudBlob.DownloadToStream(Stream target, BlobRequestOptions options) at Microsoft.WindowsAzure.Diagnostics.ControlChannel.<>c__DisplayClass10.<ConfigMonitoringPoll>b__f() at Microsoft.WindowsAzure.Diagnostics.ControlChannel.TryExpectError(HttpStatusCode status, Action act) at Microsoft.WindowsAzure.Diagnostics.ControlChannel.ConfigMonitoringPoll(Object sender, ElapsedEventArgs args); TraceSource 'WaWebHost.exe' event

Then the problem might be that you must initialise the Azure Diagnostics from the start of the WebRole - and not from the start of app in Global.asax - just add this new file to your webrole project:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using Microsoft.WindowsAzure.ServiceRuntime;

namespace MyProject.Web


public class WebRole : RoleEntryPoint


public override bool OnStart()



return base.OnStart();




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