POP3 Error in Yahoo

22:40:04 saumyabhatt1503@yahoo.com [POP3] MailClient.Accounts.SocketException: Connection failed due to the following reason:
“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…”
at MailClient.Protocols.Pop3.Pop3ReceiveCommand.Connect(WorkerStatus status)
at MailClient.Protocols.Pop3.Pop3ReceiveCommand.Execute(WorkerStatus status)
at MailClient.Commands.Command.Process(WorkerStatus status)
EnqueuedStackTrace =
at MailClient.Protocols.Pop3.Pop3Account.<>c__DisplayClass7_0.b__0()
at MailClient.Protocols.Common.AccountBase.RunIfOnline(Action actionIfOnline, Action actionIfOffline)
at MailClient.Protocols.Pop3.Pop3Account.ReceiveAsync(Action1 receivedItem, Action1 completed, CancellationToken cancellationToken)
at MailClient.Accounts.BindingAccountBase.Receive()
at MailClient.Accounts.AccountManager.ReceiveAllInternal()
at MailClient.Accounts.AccountManager.SendAndReceiveAll()
at MailClient.UI.Forms.formMain.sendReceiveAll()
at MailClient.UI.Forms.formMain.stripButton_Refresh_Click(Object sender, EventArgs e)