diff --git a/src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/ConnectionTestWithSSLCert/CertificateTest.cs b/src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/ConnectionTestWithSSLCert/CertificateTest.cs
index 4d8003d84e..fc358acb05 100644
--- a/src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/ConnectionTestWithSSLCert/CertificateTest.cs
+++ b/src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/ConnectionTestWithSSLCert/CertificateTest.cs
@@ -38,7 +38,7 @@ public class CertificateTest : IDisposable
         // SlashInstance is used to override IPV4 and IPV6 defined about so it includes an instance name
         private static string SlashInstanceName = "";
 
-        public string ForceEncryptionRegistryPath
+        private static string ForceEncryptionRegistryPath
         {
             get
             {
@@ -61,10 +61,16 @@ public string ForceEncryptionRegistryPath
 
         public CertificateTest()
         {
-            string[] tokensByBackSlash = DataTestUtility.TCPConnectionString.Split('\\');
-            if (tokensByBackSlash.Length > 1)
+            SqlConnectionStringBuilder builder = new(DataTestUtility.TCPConnectionString);
+            Assert.True(DataTestUtility.ParseDataSource(builder.DataSource, out string hostname, out _, out string instanceName));
+            if (!LocalHost.Equals(hostname, StringComparison.OrdinalIgnoreCase))
             {
-                InstanceName = tokensByBackSlash[1].Split(';')[0];
+                return;
+            }
+
+            if (!string.IsNullOrEmpty(instanceName))
+            {
+                InstanceName = instanceName;
                 InstanceNamePrefix = "MSSQL$";
                 SlashInstanceName = $"\\{InstanceName}";
             }
@@ -75,7 +81,18 @@ public CertificateTest()
             _thumbprint = Environment.GetEnvironmentVariable(ThumbPrintEnvName, EnvironmentVariableTarget.Machine);
         }
 
-        [ConditionalFact(typeof(DataTestUtility), nameof(DataTestUtility.AreConnStringsSetup), nameof(DataTestUtility.IsNotAzureServer))]
+        private static bool IsLocalHost()
+        {
+            SqlConnectionStringBuilder builder = new(DataTestUtility.TCPConnectionString);
+            Assert.True(DataTestUtility.ParseDataSource(builder.DataSource, out string hostname, out _, out _));
+            return LocalHost.Equals(hostname, StringComparison.OrdinalIgnoreCase);
+        }
+
+        private static bool AreConnStringsSetup() => DataTestUtility.AreConnStringsSetup();
+        private static bool IsNotAzureServer() => DataTestUtility.IsNotAzureServer();
+        private static bool UseManagedSNIOnWindows() => DataTestUtility.UseManagedSNIOnWindows;
+
+        [ConditionalFact(nameof(AreConnStringsSetup), nameof(IsNotAzureServer), nameof(IsLocalHost))]
         [PlatformSpecific(TestPlatforms.Windows)]
         public void OpenningConnectionWithGoodCertificateTest()
         {
@@ -104,7 +121,7 @@ public void OpenningConnectionWithGoodCertificateTest()
 
         // Provided hostname in certificate are:
         // localhost, FQDN, Loopback IPv4: 127.0.0.1, IPv6: ::1
-        [ConditionalFact(typeof(DataTestUtility), nameof(DataTestUtility.AreConnStringsSetup), nameof(DataTestUtility.IsNotAzureServer))]
+        [ConditionalFact(nameof(AreConnStringsSetup), nameof(IsNotAzureServer), nameof(IsLocalHost))]
         [PlatformSpecific(TestPlatforms.Windows)]
         public void OpeningConnectionWitHNICTest()
         {
@@ -148,7 +165,7 @@ public void OpeningConnectionWitHNICTest()
         }
 
         [ActiveIssue("26934")]
-        [ConditionalFact(typeof(DataTestUtility), nameof(DataTestUtility.AreConnStringsSetup), nameof(DataTestUtility.UseManagedSNIOnWindows), nameof(DataTestUtility.IsNotAzureServer))]
+        [ConditionalFact(nameof(AreConnStringsSetup), nameof(UseManagedSNIOnWindows), nameof(IsNotAzureServer), nameof(IsLocalHost))]
         [PlatformSpecific(TestPlatforms.Windows)]
         public void RemoteCertificateNameMismatchErrorTest()
         {