Windows Azure Caching Error

Windows Azure Caching Error

We're using Azure Cache to store Session State for an ASP.NET Application.
When we deployed our project to Azure, we get the following error.
Exception type: SocketException Exception message: No such host is known
at System.Net.Dns.HostResolutionEndHelper(IAsyncResult asyncResult) at
System.Net.Sockets.Socket.DoDnsCallback(IAsyncResult result,
MultipleAddressConnectAsyncResult context) at
System.Net.Sockets.Socket.BeginConnect(String host, Int32 port,
AsyncCallback requestCallback, Object state) at
Microsoft.ApplicationServer.Caching.SocketConnectionFactory.BeginConnect(String
host, Int32 port, AsyncCallback callback, Object state, TimeSpan timeout)
at
Microsoft.ApplicationServer.Caching.TcpClientChannelFactory.BeginConnect(String
host, Int32 port, AsyncCallback callback, Object state) at
Microsoft.ApplicationServer.Caching.TcpClientChannel.ConnectAsync() at
Microsoft.ApplicationServer.Caching.SocketClientChannel.TryGetTcpChannelUntilTimeout(TcpClientChannel
clientChannel, ITcpChannel& chnl) at
Microsoft.ApplicationServer.Caching.SocketClientChannel.Send(EndpointID
endpoint, IVelocityRequestPacket packet) at
Microsoft.ApplicationServer.Caching.SocketClientChannel.Send(EndpointID
endpoint, ICreateMessage message) at
Microsoft.ApplicationServer.Caching.SimpleSendReceiveModule.Send(EndpointID
endpoint, RequestBody request, Int32 retries) at
Microsoft.ApplicationServer.Caching.SimpleSendReceiveModule.SendMsgAndWait(EndpointID
endpt, RequestBody reqMsg, TimeSpan requestTimeout, IRequestTracker&
tracker) at
Microsoft.ApplicationServer.Caching.SocketClientProtocol.SendMessage(EndpointID
endPt, RequestBody request) at
Microsoft.ApplicationServer.Caching.DataCacheFactory.EstablishConnection(IEnumerable1
servers, RequestBody request, Func3 sendMessageDelegate,
DataCacheReadyRetryPolicy retryPolicy) at
Microsoft.ApplicationServer.Caching.SocketClientProtocol.Initialize(IEnumerable1
servers) at
Microsoft.ApplicationServer.Caching.DataCacheFactory.GetCache(String
cacheName, CreateNewCacheDelegate cacheCreationDelegate,
DataCacheInitializationViaCopyDelegate initializeDelegate) at
Microsoft.Web.DistributedCache.CacheHelpers.RunCacheCreationHooks(CacheConnectingEventArgs
fetchingEventArgs, IDataCacheFactory dataCacheFactory, Object sender,
EventHandler1 fetchingHandler, EventHandler1 fetchedHandler) at
Microsoft.Web.DistributedCache.DistributedCacheSessionStateStoreProvider.CreateInternalProvider(IHttpRuntime
httpRuntime, SessionInitializationData initData, IDataCacheFactory
dataCacheFactory, EventHandler1 cacheFetching, EventHandler`1
cacheFetched) at
Microsoft.Web.DistributedCache.DistributedCacheSessionStateStoreProvider.GetInternalProvider()
at
Microsoft.Web.DistributedCache.DistributedCacheSessionStateStoreProvider.CreateNewStoreData(HttpContext
context, Int32 timeout) at
System.Web.SessionState.SessionStateModule.InitStateStoreItem(Boolean
addToContext) at
System.Web.SessionState.SessionStateModule.CompleteAcquireState() at
System.Web.SessionState.SessionStateModule.BeginAcquireState(Object
source, EventArgs e, AsyncCallback cb, Object extraData) at
System.Web.HttpApplication.AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&
completedSynchronously)
Do you have any ideas for this issue ? Thanks