diff --git a/src/libraries/System.Net.Quic/tests/FunctionalTests/MsQuicTests.cs b/src/libraries/System.Net.Quic/tests/FunctionalTests/MsQuicTests.cs
index 7f9af662755d60..a8b6ed1fd9d59c 100644
--- a/src/libraries/System.Net.Quic/tests/FunctionalTests/MsQuicTests.cs
+++ b/src/libraries/System.Net.Quic/tests/FunctionalTests/MsQuicTests.cs
@@ -8,6 +8,7 @@
 using System.Linq;
 using System.Net.Security;
 using System.Net.Sockets;
+using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 using System.Security.Authentication;
 using System.Security.Claims;
@@ -25,6 +26,20 @@ namespace System.Net.Quic.Tests
 {
     using Configuration = System.Net.Test.Common.Configuration;
 
+    class AbortBeforeTimeout
+    {
+        [ModuleInitializer]
+        public static void Initialize()
+        {
+            if (OperatingSystem.IsBrowser())
+                return;
+
+            Thread t = new Thread(() => { Thread.Sleep(10 * 60 * 1000); Environment.FailFast("Early Timeout"); });
+            t.IsBackground = true;
+            t.Start();
+        }
+    }
+
     public class CertificateSetup : IDisposable
     {
         public readonly X509Certificate2 serverCert;
diff --git a/src/libraries/System.Net.Requests/tests/AssemblyInfo.cs b/src/libraries/System.Net.Requests/tests/AssemblyInfo.cs
index ef5fa4660024d7..70d2c38818e5e9 100644
--- a/src/libraries/System.Net.Requests/tests/AssemblyInfo.cs
+++ b/src/libraries/System.Net.Requests/tests/AssemblyInfo.cs
@@ -2,6 +2,22 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System;
+using System.Runtime.CompilerServices;
+using System.Threading;
 using Xunit;
 
 [assembly: SkipOnPlatform(TestPlatforms.Browser, "System.Net.Requests is not supported on Browser.")]
+
+class AbortBeforeTimeout
+{
+    [ModuleInitializer]
+    public static void Initialize()
+    {
+        if (OperatingSystem.IsBrowser())
+            return;
+
+        Thread t = new Thread(() => { Thread.Sleep(10 * 60 * 1000); Environment.FailFast("Early Timeout"); });
+        t.IsBackground = true;
+        t.Start();
+    }
+}
diff --git a/src/libraries/System.Net.Security/tests/FunctionalTests/AssemblyInfo.cs b/src/libraries/System.Net.Security/tests/FunctionalTests/AssemblyInfo.cs
index b80edd16806be5..6b4bc3d1cd7e92 100644
--- a/src/libraries/System.Net.Security/tests/FunctionalTests/AssemblyInfo.cs
+++ b/src/libraries/System.Net.Security/tests/FunctionalTests/AssemblyInfo.cs
@@ -2,6 +2,22 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System;
+using System.Runtime.CompilerServices;
+using System.Threading;
 using Xunit;
 
 [assembly: SkipOnPlatform(TestPlatforms.Browser, "System.Net.Security is not supported on Browser")]
+
+class AbortBeforeTimeout
+{
+    [ModuleInitializer]
+    public static void Initialize()
+    {
+        if (OperatingSystem.IsBrowser())
+            return;
+
+        Thread t = new Thread(() => { Thread.Sleep(10 * 60 * 1000); Environment.FailFast("Early Timeout"); });
+        t.IsBackground = true;
+        t.Start();
+    }
+}
diff --git a/src/libraries/System.Net.Security/tests/UnitTests/AssemblyInfo.cs b/src/libraries/System.Net.Security/tests/UnitTests/AssemblyInfo.cs
index ea25dc5f7ade53..6b4bc3d1cd7e92 100644
--- a/src/libraries/System.Net.Security/tests/UnitTests/AssemblyInfo.cs
+++ b/src/libraries/System.Net.Security/tests/UnitTests/AssemblyInfo.cs
@@ -1,6 +1,23 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System;
+using System.Runtime.CompilerServices;
+using System.Threading;
 using Xunit;
 
-[assembly: SkipOnPlatform(TestPlatforms.Browser, "System.Net.Security is not supported on Browser")]
\ No newline at end of file
+[assembly: SkipOnPlatform(TestPlatforms.Browser, "System.Net.Security is not supported on Browser")]
+
+class AbortBeforeTimeout
+{
+    [ModuleInitializer]
+    public static void Initialize()
+    {
+        if (OperatingSystem.IsBrowser())
+            return;
+
+        Thread t = new Thread(() => { Thread.Sleep(10 * 60 * 1000); Environment.FailFast("Early Timeout"); });
+        t.IsBackground = true;
+        t.Start();
+    }
+}
diff --git a/src/libraries/System.Net.WebSockets.Client/tests/AbortTest.cs b/src/libraries/System.Net.WebSockets.Client/tests/AbortTest.cs
index 85f6e875a824ca..0063404fb594af 100644
--- a/src/libraries/System.Net.WebSockets.Client/tests/AbortTest.cs
+++ b/src/libraries/System.Net.WebSockets.Client/tests/AbortTest.cs
@@ -1,15 +1,31 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System;
 using System.Collections.Generic;
 using System.Net.Http;
 using System.Net.Test.Common;
+using System.Runtime.CompilerServices;
 using System.Threading;
 using System.Threading.Tasks;
 
 using Xunit;
 using Xunit.Abstractions;
 
+class AbortBeforeTimeout
+{
+    [ModuleInitializer]
+    public static void Initialize()
+    {
+        if (OperatingSystem.IsBrowser())
+            return;
+
+        Thread t = new Thread(() => { Thread.Sleep(10 * 60 * 1000); Environment.FailFast("Early Timeout"); });
+        t.IsBackground = true;
+        t.Start();
+    }
+}
+
 namespace System.Net.WebSockets.Client.Tests
 {
     public sealed class InvokerAbortTest : AbortTest