diff --git a/src/Exceptionless/Submission/DefaultSubmissionClient.cs b/src/Exceptionless/Submission/DefaultSubmissionClient.cs
index c808c88a..3fef0167 100644
--- a/src/Exceptionless/Submission/DefaultSubmissionClient.cs
+++ b/src/Exceptionless/Submission/DefaultSubmissionClient.cs
@@ -127,7 +127,7 @@ private HttpClient CreateHttpClient(string userAgent) {
 #else
             var handler = new HttpClientHandler { UseDefaultCredentials = true };
 #if !PORTABLE && !NETSTANDARD1_2
-            handler.ServerCertificateCustomValidationCallback = delegate { return true; };
+            //handler.ServerCertificateCustomValidationCallback = delegate { return true; };
 #endif
 #endif