diff --git a/framework/Core/lib/Horde/Core/ActiveSync/Driver.php b/framework/Core/lib/Horde/Core/ActiveSync/Driver.php
index 60106b1f078..5182d6b6816 100644
--- a/framework/Core/lib/Horde/Core/ActiveSync/Driver.php
+++ b/framework/Core/lib/Horde/Core/ActiveSync/Driver.php
@@ -202,6 +202,7 @@ public function authenticate($username, $password, $domain = null)
                 $injector->getInstance('Horde_Log_Logger')->notice(sprintf(
                     'Access granted based on transparent authentication of user %s, but ActiveSync client is requesting access for %s.',
                     $GLOBALS['registry']->getAuth(), $username));
+                $GLOBALS['registry']->clearAuth();
                 return false;
             }
             $this->_logger->info(sprintf(
diff --git a/framework/Core/lib/Horde/Core/Auth/X509.php b/framework/Core/lib/Horde/Core/Auth/X509.php
index d0db92cf981..3209515a50b 100644
--- a/framework/Core/lib/Horde/Core/Auth/X509.php
+++ b/framework/Core/lib/Horde/Core/Auth/X509.php
@@ -25,4 +25,13 @@ protected function _validate($certificate)
         return true;
     }
 
+    public function transparent()
+    {
+        if (parent::transparent()) {
+            $GLOBALS['registry']->setAuth($this->getCredential('userId'), $this->getCredential('credentials'));
+            return true;
+        }
+
+        return false;
+    }
 }