Merge pull request #19487 from baulig/work-httplistener-52508

Fix Mono bug #52508 in HttpListener when doing multiple Https request.

Author: stephentoub

src/System.Net.HttpListener/src/System/Net/Managed/HttpConnection.cs

@@ -103,6 +103,9 @@ public HttpConnection(Socket sock, HttpEndPointListener epl, bool secure, X509Ce
             }
 
             _timer = new Timer(OnTimeout, null, Timeout.Infinite, Timeout.Infinite);
+            if (_sslStream != null) {
+                _sslStream.AuthenticateAsServer (_cert, true, (SslProtocols)ServicePointManager.SecurityProtocol, false);
+            }
             Init();
         }
 
@@ -123,11 +126,6 @@ internal SslStream SslStream
 
         private void Init()
         {
-            if (_sslStream != null)
-            {
-                _sslStream.AuthenticateAsServer(_cert, true, (SslProtocols)ServicePointManager.SecurityProtocol, false);
-            }
-
             _contextBound = false;
             _requestStream = null;
             _responseStream = null;