diff --git a/src/libraries/Common/tests/System/Net/Configuration.Certificates.cs b/src/libraries/Common/tests/System/Net/Configuration.Certificates.cs
index c0f114a82d35b7..1d788acbb6913e 100644
--- a/src/libraries/Common/tests/System/Net/Configuration.Certificates.cs
+++ b/src/libraries/Common/tests/System/Net/Configuration.Certificates.cs
@@ -7,6 +7,7 @@
 using System.Security.Cryptography;
 using System.Security.Cryptography.X509Certificates;
 using System.Threading;
+using Test.Cryptography;
 using Xunit;
 
 namespace System.Net.Test.Common
@@ -36,9 +37,10 @@ static Certificates()
                 {
                     try
                     {
-                        byte[] serverCertificateBytes = File.ReadAllBytes(Path.Combine(TestDataFolder, "testservereku.contoso.com.pfx"));
-                        byte[] clientCertificateBytes = File.ReadAllBytes(Path.Combine(TestDataFolder, "testclienteku.contoso.com.pfx"));
-                        byte[] noEKUCertificateBytes = File.ReadAllBytes(Path.Combine(TestDataFolder, "testnoeku.contoso.com.pfx"));
+                        string contosoPfxSuffix = PlatformSupport.IsRC2Supported ? ".pfx" : ".noRC2.pfx";
+                        byte[] serverCertificateBytes = File.ReadAllBytes(Path.Combine(TestDataFolder, $"testservereku.contoso.com{contosoPfxSuffix}"));
+                        byte[] clientCertificateBytes = File.ReadAllBytes(Path.Combine(TestDataFolder, $"testclienteku.contoso.com{contosoPfxSuffix}"));
+                        byte[] noEKUCertificateBytes = File.ReadAllBytes(Path.Combine(TestDataFolder, $"testnoeku.contoso.com{contosoPfxSuffix}"));
                         byte[] selfSignedServerCertificateBytes = File.ReadAllBytes(Path.Combine(TestDataFolder, "testselfsignedservereku.contoso.com.pfx"));
                         byte[] selfSignedClientCertificateBytes = File.ReadAllBytes(Path.Combine(TestDataFolder, "testselfsignedclienteku.contoso.com.pfx"));
 
diff --git a/src/libraries/System.Net.Http.Json/tests/FunctionalTests/System.Net.Http.Json.Functional.Tests.csproj b/src/libraries/System.Net.Http.Json/tests/FunctionalTests/System.Net.Http.Json.Functional.Tests.csproj
index 81605d947b365c..9279c127331a05 100644
--- a/src/libraries/System.Net.Http.Json/tests/FunctionalTests/System.Net.Http.Json.Functional.Tests.csproj
+++ b/src/libraries/System.Net.Http.Json/tests/FunctionalTests/System.Net.Http.Json.Functional.Tests.csproj
@@ -26,6 +26,8 @@
              Link="Common\System\Net\Http\HttpMessageHandlerLoopbackServer.cs" />
     <Compile Include="$(CommonTestPath)System\Net\Http\GenericLoopbackServer.cs"
              Link="Common\System\Net\Http\GenericLoopbackServer.cs" />
+    <Compile Include="$(CommonTestPath)System\Security\Cryptography\PlatformSupport.cs"
+             Link="CommonTest\System\Security\Cryptography\PlatformSupport.cs" />
     <Compile Include="$(CommonTestPath)System\Threading\Tasks\TaskTimeoutExtensions.cs"
              Link="Common\System\Threading\Tasks\TaskTimeoutExtensions.cs" />
   </ItemGroup>
diff --git a/src/libraries/System.Net.Http.WinHttpHandler/tests/FunctionalTests/System.Net.Http.WinHttpHandler.Functional.Tests.csproj b/src/libraries/System.Net.Http.WinHttpHandler/tests/FunctionalTests/System.Net.Http.WinHttpHandler.Functional.Tests.csproj
index d27cac268cecd6..ff47b70d014d9e 100644
--- a/src/libraries/System.Net.Http.WinHttpHandler/tests/FunctionalTests/System.Net.Http.WinHttpHandler.Functional.Tests.csproj
+++ b/src/libraries/System.Net.Http.WinHttpHandler/tests/FunctionalTests/System.Net.Http.WinHttpHandler.Functional.Tests.csproj
@@ -135,6 +135,8 @@
              Link="Common\System\Net\Http\SyncBlockingContent.cs" />
     <Compile Include="$(CommonTestPath)System\Net\Http\ThrowingContent.cs"
              Link="Common\System\Net\Http\ThrowingContent.cs" />
+    <Compile Include="$(CommonTestPath)System\Security\Cryptography\PlatformSupport.cs"
+             Link="CommonTest\System\Security\Cryptography\PlatformSupport.cs" />
     <Compile Include="$(CommonTestPath)System\Threading\Tasks\TaskTimeoutExtensions.cs"
              Link="Common\System\Threading\Tasks\TaskTimeoutExtensions.cs" />
     <Compile Include="$(CommonTestPath)System\Threading\TrackingSynchronizationContext.cs"
diff --git a/src/libraries/System.Net.Http/tests/FunctionalTests/System.Net.Http.Functional.Tests.csproj b/src/libraries/System.Net.Http/tests/FunctionalTests/System.Net.Http.Functional.Tests.csproj
index cb9fb649dfe9b2..96531b22b6aaef 100644
--- a/src/libraries/System.Net.Http/tests/FunctionalTests/System.Net.Http.Functional.Tests.csproj
+++ b/src/libraries/System.Net.Http/tests/FunctionalTests/System.Net.Http.Functional.Tests.csproj
@@ -29,6 +29,8 @@
              Link="Common\System\IO\DelegateStream.cs" />
     <Compile Include="$(CommonTestPath)System\Net\RemoteServerQuery.cs"
              Link="Common\System\Net\RemoteServerQuery.cs" />
+    <Compile Include="$(CommonTestPath)System\Security\Cryptography\PlatformSupport.cs"
+             Link="CommonTest\System\Security\Cryptography\PlatformSupport.cs" />
     <Compile Include="$(CommonTestPath)System\Net\Configuration.Certificates.cs"
              Link="Common\System\Net\Configuration.Certificates.cs" />
     <Compile Include="$(CommonTestPath)System\Net\EventSourceTestLogging.cs"
diff --git a/src/libraries/System.Net.Requests/tests/System.Net.Requests.Tests.csproj b/src/libraries/System.Net.Requests/tests/System.Net.Requests.Tests.csproj
index be502f34b17d8e..7e2504625d24d7 100644
--- a/src/libraries/System.Net.Requests/tests/System.Net.Requests.Tests.csproj
+++ b/src/libraries/System.Net.Requests/tests/System.Net.Requests.Tests.csproj
@@ -29,6 +29,8 @@
              Link="Common\System\Net\Http\LoopbackServer.AuthenticationHelpers.cs" />
     <Compile Include="$(CommonTestPath)System\Net\Http\GenericLoopbackServer.cs"
              Link="Common\System\Net\Http\GenericLoopbackServer.cs" />
+    <Compile Include="$(CommonTestPath)System\Security\Cryptography\PlatformSupport.cs"
+             Link="CommonTest\System\Security\Cryptography\PlatformSupport.cs" />
     <Compile Include="$(CommonTestPath)System\Threading\Tasks\TaskTimeoutExtensions.cs"
              Link="Common\System\Threading\Tasks\TaskTimeoutExtensions.cs" />
   </ItemGroup>
diff --git a/src/libraries/System.Net.Security/tests/FunctionalTests/System.Net.Security.Tests.csproj b/src/libraries/System.Net.Security/tests/FunctionalTests/System.Net.Security.Tests.csproj
index 7ceae63c095485..cf473c3ca94bc0 100644
--- a/src/libraries/System.Net.Security/tests/FunctionalTests/System.Net.Security.Tests.csproj
+++ b/src/libraries/System.Net.Security/tests/FunctionalTests/System.Net.Security.Tests.csproj
@@ -69,10 +69,12 @@
              Link="Common\System\Net\VerboseTestLogging.cs" />
     <Compile Include="$(CommonTestPath)System\Net\EventSourceTestLogging.cs"
              Link="Common\System\Net\EventSourceTestLogging.cs" />
+    <Compile Include="$(CommonTestPath)System\Security\Cryptography\PlatformSupport.cs"
+             Link="CommonTest\System\Security\Cryptography\PlatformSupport.cs" />
     <Compile Include="$(CommonTestPath)System\Security\Cryptography\X509Certificates\CertificateAuthority.cs"
-             Link="CommonTest\System\Security\Cryptography\509Certificates\CertificateAuthority.cs" />
+             Link="CommonTest\System\Security\Cryptography\X509Certificates\CertificateAuthority.cs" />
     <Compile Include="$(CommonTestPath)System\Security\Cryptography\X509Certificates\RevocationResponder.cs"
-             Link="CommonTest\System\Security\Cryptography\509Certificates\RevocationResponder.cs" />
+             Link="CommonTest\System\Security\Cryptography\X509Certificates\RevocationResponder.cs" />
     <Compile Include="$(CommonTestPath)System\Threading\Tasks\TaskTimeoutExtensions.cs"
              Link="Common\System\Threading\Tasks\TaskTimeoutExtensions.cs" />
     <Compile Include="$(CommonPath)System\Threading\Tasks\TaskToApm.cs"
diff --git a/src/libraries/System.Net.WebClient/tests/System.Net.WebClient.Tests.csproj b/src/libraries/System.Net.WebClient/tests/System.Net.WebClient.Tests.csproj
index bd9c2cc5549542..fc248601812ef1 100644
--- a/src/libraries/System.Net.WebClient/tests/System.Net.WebClient.Tests.csproj
+++ b/src/libraries/System.Net.WebClient/tests/System.Net.WebClient.Tests.csproj
@@ -21,6 +21,8 @@
              Link="Common\System\Net\Http\LoopbackServer.cs" />
     <Compile Include="$(CommonTestPath)System\Net\Http\GenericLoopbackServer.cs"
              Link="Common\System\Net\Http\GenericLoopbackServer.cs" />
+    <Compile Include="$(CommonTestPath)System\Security\Cryptography\PlatformSupport.cs"
+             Link="CommonTest\System\Security\Cryptography\PlatformSupport.cs" />
     <Compile Include="$(CommonTestPath)System\Threading\Tasks\TaskTimeoutExtensions.cs"
              Link="Common\System\Threading\Tasks\TaskTimeoutExtensions.cs" />
   </ItemGroup>
diff --git a/src/libraries/System.Net.WebSockets.Client/tests/System.Net.WebSockets.Client.Tests.csproj b/src/libraries/System.Net.WebSockets.Client/tests/System.Net.WebSockets.Client.Tests.csproj
index 248546468d0fa0..a1323fa83db1ed 100644
--- a/src/libraries/System.Net.WebSockets.Client/tests/System.Net.WebSockets.Client.Tests.csproj
+++ b/src/libraries/System.Net.WebSockets.Client/tests/System.Net.WebSockets.Client.Tests.csproj
@@ -29,6 +29,8 @@
              Link="Common\System\Net\Http\LoopbackServer.cs" />
     <Compile Include="$(CommonTestPath)System\Net\Http\GenericLoopbackServer.cs"
              Link="Common\System\Net\Http\GenericLoopbackServer.cs" />
+    <Compile Include="$(CommonTestPath)System\Security\Cryptography\PlatformSupport.cs"
+             Link="CommonTest\System\Security\Cryptography\PlatformSupport.cs" />
     <Compile Include="$(CommonTestPath)System\Threading\Tasks\TaskTimeoutExtensions.cs"
              Link="Common\System\Threading\Tasks\TaskTimeoutExtensions.cs" />
     <Compile Include="AbortTest.cs" />