diff --git a/src/Fault.php b/src/Fault.php
index 109dc9c..851640e 100644
--- a/src/Fault.php
+++ b/src/Fault.php
@@ -10,6 +10,8 @@
 
 namespace Zend\XmlRpc;
 
+use SimpleXMLElement;
+
 /**
  * XMLRPC Faults
  *
@@ -171,7 +173,7 @@ public function getEncoding()
      * @param string $fault
      * @return boolean Returns true if successfully loaded fault response, false
      * if response was not a fault response
-     * @throws \Zend\XmlRpc\Exception\ExceptionInterface if no or faulty XML provided, or if fault
+     * @throws Exception\ExceptionInterface if no or faulty XML provided, or if fault
      * response does not contain either code or message
      */
     public function loadXml($fault)
@@ -180,12 +182,25 @@ public function loadXml($fault)
             throw new Exception\InvalidArgumentException('Invalid XML provided to fault');
         }
 
+        $xmlErrorsFlag = libxml_use_internal_errors(true);
         try {
-            $xml = new \SimpleXMLElement($fault);
+            $xml = new SimpleXMLElement($fault);
         } catch (\Exception $e) {
             // Not valid XML
             throw new Exception\InvalidArgumentException('Failed to parse XML fault: ' .  $e->getMessage(), 500, $e);
         }
+        if (!$xml instanceof SimpleXMLElement) {
+            $errors = libxml_get_errors();
+            $errors = array_reduce($errors, function ($result, $item) {
+                if (empty($result)) {
+                    return $item->message;
+                }
+                return $result . '; ' . $item->message;
+            }, '');
+            libxml_use_internal_errors($xmlErrorsFlag);
+            throw new Exception\InvalidArgumentException('Failed to parse XML fault: ' . $errors, 500);
+        }
+        libxml_use_internal_errors($xmlErrorsFlag);
 
         // Check for fault
         if (!$xml->fault) {
diff --git a/src/Request.php b/src/Request.php
index 379c821..9d21689 100644
--- a/src/Request.php
+++ b/src/Request.php
@@ -10,6 +10,10 @@
 
 namespace Zend\XmlRpc;
 
+use DOMDocument;
+use SimpleXMLElement;
+use Zend\Stdlib\ErrorHandler;
+
 /**
  * XmlRpc Request object
  *
@@ -284,9 +288,10 @@ public function loadXml($request)
         }
 
         // @see ZF-12293 - disable external entities for security purposes
-        $loadEntities = libxml_disable_entity_loader(true);
+        $loadEntities  = libxml_disable_entity_loader(true);
+        $xmlErrorsFlag = libxml_use_internal_errors(true);
         try {
-            $dom = new \DOMDocument;
+            $dom = new DOMDocument;
             $dom->loadXML($request);
             foreach ($dom->childNodes as $child) {
                 if ($child->nodeType === XML_DOCUMENT_TYPE_NODE) {
@@ -295,14 +300,24 @@ public function loadXml($request)
                     );
                 }
             }
-            $xml = simplexml_import_dom($dom);
-            //$xml = new \SimpleXMLElement($request);
+            ErrorHandler::start();
+            $xml   = simplexml_import_dom($dom);
+            $error = ErrorHandler::stop();
             libxml_disable_entity_loader($loadEntities);
+            libxml_use_internal_errors($xmlErrorsFlag);
         } catch (\Exception $e) {
             // Not valid XML
             $this->fault = new Fault(631);
             $this->fault->setEncoding($this->getEncoding());
             libxml_disable_entity_loader($loadEntities);
+            libxml_use_internal_errors($xmlErrorsFlag);
+            return false;
+        }
+        if (!$xml instanceof SimpleXMLElement || $error) {
+            // Not valid XML
+            $this->fault = new Fault(631);
+            $this->fault->setEncoding($this->getEncoding());
+            libxml_use_internal_errors($xmlErrorsFlag);
             return false;
         }
 
diff --git a/src/Server.php b/src/Server.php
index 8ba0c3f..6a22434 100644
--- a/src/Server.php
+++ b/src/Server.php
@@ -172,8 +172,8 @@ public function __call($method, $params)
      *
      * @param string|array|callable $function  Valid callback
      * @param string                $namespace Optional namespace prefix
+     * @throws Server\Exception\InvalidArgumentException
      * @return void
-     * @throws \Zend\XmlRpc\Exception\InvalidArgumentException
      */
     public function addFunction($function, $namespace = '')
     {