diff --git a/OpenSim/Framework/WebUtil.cs b/OpenSim/Framework/WebUtil.cs
index 131ae5065a..30b548542e 100644
--- a/OpenSim/Framework/WebUtil.cs
+++ b/OpenSim/Framework/WebUtil.cs
@@ -33,6 +33,8 @@ using System.Globalization;
 using System.IO;
 using System.IO.Compression;
 using System.Net;
+using System.Net.Security;
+using System.Security.Cryptography.X509Certificates;
 using System.Reflection;
 using System.Text;
 using System.Web;
@@ -92,6 +94,19 @@ namespace OpenSim.Framework
         /// </remarks>
         public const int MaxRequestDiagLength = 200;
 
+
+        public static bool ValidateServerCertificateNoChecks(
+            object sender,
+            X509Certificate certificate,
+            X509Chain chain,
+            SslPolicyErrors sslPolicyErrors)
+        {
+            sslPolicyErrors &= ~SslPolicyErrors.RemoteCertificateChainErrors;
+            sslPolicyErrors &= ~SslPolicyErrors.RemoteCertificateNameMismatch;
+            if (sslPolicyErrors == SslPolicyErrors.None)
+                return true;
+            return false;
+        }
         #region JSONRequest
 
         /// <summary>
diff --git a/OpenSim/Region/OptionalModules/Avatar/Voice/VivoxVoice/VivoxVoiceModule.cs b/OpenSim/Region/OptionalModules/Avatar/Voice/VivoxVoice/VivoxVoiceModule.cs
index c690e8e164..3201a33030 100644
--- a/OpenSim/Region/OptionalModules/Avatar/Voice/VivoxVoice/VivoxVoiceModule.cs
+++ b/OpenSim/Region/OptionalModules/Avatar/Voice/VivoxVoice/VivoxVoiceModule.cs
@@ -1162,6 +1162,7 @@ namespace OpenSim.Region.OptionalModules.Avatar.Voice.VivoxVoice
                     //m_log.DebugFormat("[VivoxVoice] Sending request <{0}>", requrl);
 
                     HttpWebRequest req = (HttpWebRequest)WebRequest.Create(requrl);
+                    req.ServerCertificateValidationCallback = WebUtil.ValidateServerCertificateNoChecks; // vivox servers have invalid certs
 
                     // We are sending just parameters, no content
                     req.ContentLength = 0;