Exception: CheckConnection: Connection task completed but connection not established: Faulted. Exception:
System.AggregateException: One or more errors occurred. ---> System.Net.Sockets.SocketException: 由于目标计算机积极拒绝，无法连接。
at System.Net.Sockets.SocketAsyncResult.CheckIfThrowDelayedException () [0x00014] in <d2957de1c3fd4781a43d89572183136c>:0
at System.Net.Sockets.Socket.EndConnect (System.IAsyncResult asyncResult) [0x0002c] in <d2957de1c3fd4781a43d89572183136c>:0
at System.Net.Sockets.SocketTaskExtensions+<>c.<ConnectAsync>b__2_1 (System.IAsyncResult asyncResult) [0x00006] in <d2957de1c3fd4781a43d89572183136c>:0
at System.Threading.Tasks.TaskFactory`1[TResult].FromAsyncCoreLogic (System.IAsyncResult iar, System.Func`2[T,TResult] endFunction, System.Action`1[T] endAction, System.Threading.Tasks.Task`1[TResult] promise, System.Boolean requiresSynchronization) [0x00019] in <e1319b7195c343e79b385cd3aa43f5dc>:0
--- End of inner exception stack trace ---
---> (Inner Exception #0) System.Net.Sockets.SocketException (0x80004005): 由于目标计算机积极拒绝，无法连接。