error messages

Monitoring a single server. Repository on monitored server. No issues for a couple of weeks, suddenly getting the following errors suggesting the monitor cannot connect to the monitored server. Looking at the monitored server, don't see unusual conditions.

/MachineOverview/ProcessData: 12152 error
No Response (24 Aug 2011 13:46)

/MachineOverview/MachineData: 500 error
System.IO.IOException: Unable to read data from the transport connection: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond
at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
--- End of inner exception stack trace ---
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
at Mono.WebServer.XSPWorker.Read(Byte[] buffer, Int32 position, Int32 size)
at Mono.WebServer.BaseRequestBroker.Read(Int32 requestId, Int32 size, Byte[]& buffer)
at Mono.WebServer.XSPWorkerRequest.ReadInput(Byte[] buffer, Int32 offset, Int32 size)
at Mono.WebServer.XSPWorkerRequest.ReadEntityBody(Byte[] buffer, Int32 size)
at System.Web.HttpRequest.GetEntireRawContent()
at System.Web.HttpRequest.FillInFormCollection()
at System.Web.HttpRequest.get_Form()
at System.Web.HttpRequest.get_HasForm()
at System.Web.Caching.OutputCacheModule.CreateOutputCachedItemKey(String path, HttpVerb verb, HttpContext context, CachedVary cachedVary)
at System.Web.Caching.OutputCacheModule.CreateOutputCachedItemKey(HttpContext context, CachedVary cachedVary)
at System.Web.Caching.OutputCacheModule.OnEnter(Object source, EventArgs eventArgs)
at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

/MachineOverview/NetworkData: 12152 error
No Response (24 Aug 2011 13:49)

/MachineOverview/MiniGridData: 500 error
System.IO.IOException: Unable to read data from the transport connection: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond
at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
--- End of inner exception stack trace ---
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
at Mono.WebServer.XSPWorker.Read(Byte[] buffer, Int32 position, Int32 size)
at Mono.WebServer.BaseRequestBroker.Read(Int32 requestId, Int32 size, Byte[]& buffer)
at Mono.WebServer.XSPWorkerRequest.ReadInput(Byte[] buffer, Int32 offset, Int32 size)
at Mono.WebServer.XSPWorkerRequest.ReadEntityBody(Byte[] buffer, Int32 size)
at System.Web.HttpRequest.GetEntireRawContent()
at System.Web.HttpRequest.FillInFormCollection()
at System.Web.HttpRequest.get_Form()
at System.Web.HttpRequest.get_HasForm()
at System.Web.Caching.OutputCacheModule.CreateOutputCachedItemKey(String path, HttpVerb verb, HttpContext context, CachedVary cachedVary)
at System.Web.Caching.OutputCacheModule.CreateOutputCachedItemKey(HttpContext context, CachedVary cachedVary)
at System.Web.Caching.OutputCacheModule.OnEnter(Object source, EventArgs eventArgs)
at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

/MachineOverview/LogicalDiskData: 12152 error
No Response (24 Aug 2011 13:50)

/OverviewSideNavigation: 12152 error
No Response (24 Aug 2011 13:50)