diff --git a/src/core/Akka.Cluster.Tests/ClusterSpec.cs b/src/core/Akka.Cluster.Tests/ClusterSpec.cs
index 86a976eaff6..27a9fb81f11 100644
--- a/src/core/Akka.Cluster.Tests/ClusterSpec.cs
+++ b/src/core/Akka.Cluster.Tests/ClusterSpec.cs
@@ -116,7 +116,6 @@ public void A_cluster_must_send_current_cluster_state_to_one_receiver_when_reque
             ExpectMsg<ClusterEvent.CurrentClusterState>();
         }
 
-        // this should be the last test step, since the cluster is shutdown
         [Fact]
         public void A_cluster_must_publish_member_removed_when_shutdown()
         {
@@ -199,11 +198,6 @@ public void A_cluster_must_complete_LeaveAsync_task_upon_being_removed()
             Cluster.Get(sys2).LeaveAsync().IsCompleted.Should().BeTrue();
         }
 
-        //#if CORECLR
-        //        [Fact(Skip = "Fails on .NET Core")]
-        //#else
-        //        [Fact(Skip = "Fails flakily on .NET 4.5")]
-        //#endif
         [Fact]
         public void A_cluster_must_return_completed_LeaveAsync_task_if_member_already_removed()
         {
@@ -339,29 +333,6 @@ public void A_cluster_must_be_able_to_JoinAsync()
             }).Wait(timeout);
         }
 
-        [Fact]
-        public void A_cluster_must_be_able_to_prematurelly_cancel_JoinAsync()
-        {
-            var timeout = TimeSpan.FromSeconds(10);
-
-            try
-            {
-                var cancel = new CancellationTokenSource();
-                cancel.Cancel(true);
-                var task = _cluster.JoinAsync(_selfAddress, cancel.Token);
-
-                Assert.Throws<AggregateException>(() => task.Wait(timeout))
-                    .Flatten()
-                    .InnerException.Should().BeOfType<TaskCanceledException>();
-
-                task.IsCanceled.Should().BeTrue();
-            }
-            finally
-            {
-                _cluster.Shutdown();
-            }
-        }
-
         [Fact]
         public void A_cluster_JoinAsync_must_fail_if_could_not_connect_to_cluster()
         {
@@ -442,28 +413,6 @@ public void A_cluster_JoinSeedNodesAsync_must_fail_if_could_not_connect_to_clust
             }
         }
 
-        [Fact]
-        public void A_cluster_must_be_able_to_prematurelly_cancel_join_async_seed_nodes()
-        {
-            var timeout = TimeSpan.FromSeconds(10);
-
-            try
-            {
-                var cancel = new CancellationToken(true);
-                var task = _cluster.JoinSeedNodesAsync(new[] { _selfAddress }, cancel);
-
-                Assert.Throws<AggregateException>(() => task.Wait(timeout))
-                    .Flatten()
-                    .InnerException.Should().BeOfType<TaskCanceledException>();
-
-                task.IsCanceled.Should().BeTrue();
-            }
-            finally
-            {
-                _cluster.Shutdown();
-            }
-        }
-
         [Fact]
         public void A_cluster_must_allow_to_resolve_RemotePathOf_any_actor()
         {