Am facing this issue and I found event log like this I added in below.
Message: Exception of type 'System.Web.HttpUnhandledException' was thrown.
Exception type: System.Web.HttpUnhandledException
Stack trace:
at System.Web.UI.Page.HandleError(Exception e)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
at System.Web.UI.Page.ProcessRequest()
at System.Web.UI.Page.ProcessRequest(HttpContext context)
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
Message: Unable to connect to the remote server
Exception type: System.Net.WebException
Stack trace:
at System.Net.HttpWebRequest.GetResponse()
at Core.HttpClient.GetResponse(HttpWebRequest request)
at Service.Cpd.CpdRequestService.MakeGetRequest[T](String action, NameValueCollection idCollection)
at Service.MembershipDashboardService.GetDashboardDataForUser(Guid userGuid, String membershipDescription)
at SiteWebParts.Memberships.SiteWebParts_Memberships_DashboardInfo.GetCpdMembershipData()
at SiteWebParts.Memberships.SiteWebParts_Memberships_DashboardInfo.LoadAllDashboardData()
at System.Web.UI.Control.OnLoad(EventArgs e)
at CMS.Base.Web.UI.AbstractUserControl.OnLoad(EventArgs e)
at CMS.PortalEngine.Web.UI.CMSAbstractWebPart.OnLoad(EventArgs e)
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
Message: 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 xx.xx.x.xxx:443
Exception type: System.Net.Sockets.SocketException
Stack trace:
at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)
at System.Net.Sockets.Socket.InternalConnect(EndPoint remoteEP)
at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)