diff --git a/src/main/java/com/twilio/Twilio.java b/src/main/java/com/twilio/Twilio.java
index cd39dfb675..74f6cd0e64 100644
--- a/src/main/java/com/twilio/Twilio.java
+++ b/src/main/java/com/twilio/Twilio.java
@@ -252,7 +252,7 @@ public static void validateSslCertificate() {
 
 
     public static void validateSslCertificate(NetworkHttpClient client) {
-        final Request request = new Request(HttpMethod.GET, "https://api.twilio.com:8443");
+        final Request request = new Request(HttpMethod.GET, "https://tls-test.twilio.com:443");
         try {
             final Response response = client.makeRequest(request);
 
diff --git a/src/test/java/com/twilio/TwilioTest.java b/src/test/java/com/twilio/TwilioTest.java
index 56ea5cf2a1..550f2d491f 100644
--- a/src/test/java/com/twilio/TwilioTest.java
+++ b/src/test/java/com/twilio/TwilioTest.java
@@ -128,7 +128,7 @@ public void testSetRestClient() {
 
     @Test
     public void testValidateSslCertificateError() {
-        final Request request = new Request(HttpMethod.GET, "https://api.twilio.com:8443");
+        final Request request = new Request(HttpMethod.GET, "https://tls-test.twilio.com:443");
         when(networkHttpClient.makeRequest(request)).thenReturn(new Response("", 500));
         try {
             Twilio.validateSslCertificate(networkHttpClient);
@@ -140,7 +140,7 @@ public void testValidateSslCertificateError() {
 
     @Test
     public void testValidateSslCertificateException() {
-        final Request request = new Request(HttpMethod.GET, "https://api.twilio.com:8443");
+        final Request request = new Request(HttpMethod.GET, "https://tls-test.twilio.com:443");
         when(networkHttpClient.makeRequest(request)).thenThrow(new ApiException("No"));
 
         try {
@@ -153,7 +153,7 @@ public void testValidateSslCertificateException() {
 
     @Test
     public void testValidateSslCertificateSuccess() {
-        final Request request = new Request(HttpMethod.GET, "https://api.twilio.com:8443");
+        final Request request = new Request(HttpMethod.GET, "https://tls-test.twilio.com:443");
         when(networkHttpClient.makeRequest(request)).thenReturn(new Response("", 200));
 
         Twilio.validateSslCertificate(networkHttpClient);