diff --git a/src/libraries/System.Diagnostics.DiagnosticSource/tests/MetricEventSourceTests.cs b/src/libraries/System.Diagnostics.DiagnosticSource/tests/MetricEventSourceTests.cs
index 1c3282c0746382..b468bbd2fb597f 100644
--- a/src/libraries/System.Diagnostics.DiagnosticSource/tests/MetricEventSourceTests.cs
+++ b/src/libraries/System.Diagnostics.DiagnosticSource/tests/MetricEventSourceTests.cs
@@ -248,6 +248,7 @@ public void EventSourcePublishesTimeSeriesWithTags()
 
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotBrowser))]
         [OuterLoop("Slow and has lots of console spew")]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/79749", TargetFrameworkMonikers.NetFramework)]
         public void EventSourceFiltersInstruments()
         {
             using Meter meterA = new Meter("TestMeterA");
diff --git a/src/libraries/System.Net.Sockets/tests/FunctionalTests/Connect.cs b/src/libraries/System.Net.Sockets/tests/FunctionalTests/Connect.cs
index 762e446ea6439d..8141ae29e04216 100644
--- a/src/libraries/System.Net.Sockets/tests/FunctionalTests/Connect.cs
+++ b/src/libraries/System.Net.Sockets/tests/FunctionalTests/Connect.cs
@@ -218,6 +218,7 @@ public ConnectTask(ITestOutputHelper output) : base(output) {}
 
         [OuterLoop]
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/79820", TestPlatforms.Linux | TestPlatforms.Android)]
         public static void Connect_ThrowSocketException_Success()
         {
             using (Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp))
diff --git a/src/libraries/System.Net.WebClient/tests/WebClientTest.cs b/src/libraries/System.Net.WebClient/tests/WebClientTest.cs
index a9b9d80e363fc1..ec363013e846da 100644
--- a/src/libraries/System.Net.WebClient/tests/WebClientTest.cs
+++ b/src/libraries/System.Net.WebClient/tests/WebClientTest.cs
@@ -697,6 +697,7 @@ public async Task UploadString_Success(Uri server)
         [OuterLoop("Uses external servers")]
         [Theory]
         [MemberData(nameof(EchoServers))]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/79731")]
         public async Task UploadValues_Success(Uri echoServer)
         {
             var wc = new WebClient();