diff -ruN libraries.orig/common.inc.php libraries/common.inc.php
--- libraries.orig/common.inc.php	2017-03-29 07:15:31.000000000 -0500
+++ libraries/common.inc.php	2017-04-08 19:13:32.936610526 -0500
@@ -649,6 +649,9 @@
         $auth_plugin = new $fqnAuthClass($plugin_manager);
 
         if (! $auth_plugin->authCheck()) {
+            //DA logging
+            Logging::log_to_file('', "not authenticated");
+
             /* Force generating of new session on login */
             PMA_secureSession();
             $auth_plugin->auth();
diff -ruN libraries.orig/Logging.php libraries/Logging.php
--- libraries.orig/Logging.php	2017-03-29 07:15:31.000000000 -0500
+++ libraries/Logging.php	2017-04-08 19:14:21.119610531 -0500
@@ -9,6 +9,9 @@
  */
 namespace PMA\libraries;
 
+define("PMA\libraries\AUTH_LOG_DIR", "./log");
+define("PMA\libraries\AUTH_LOG_FILE", "./log/auth.log");
+
 /**
  * Misc logging functions
  *
@@ -39,5 +42,61 @@
             );
             closelog();
         }
+	Logging::log_to_file($user, $status);
     }
+
+  private static function ensure_log_dir()
+  {
+        $LOG_DIR=AUTH_LOG_DIR;
+        if (is_dir($LOG_DIR))
+                return true;
+
+        if (!mkdir($LOG_DIR, 0770))
+                return false;
+  }
+
+  public static function log_to_file($user, $status)
+  {
+        if (!Logging::ensure_log_dir())
+                return false;
+
+        $LOG_FILE=AUTH_LOG_FILE;
+
+        if ($user == '')
+        {
+                $user = PMA_getenv('PHP_AUTH_USER');
+        }
+
+        if ($user == '')
+                return true;
+
+        //remove any ' characters from $user
+        $user = urlencode($user);
+
+        //check for logout
+        if ($status == 'not authenticated')
+        {
+                if (isset($_GET['old_usr']) && isset($_SERVER['PHP_AUTH_USER']))
+                {
+                        if ($_GET['old_usr'] == $_SERVER['PHP_AUTH_USER'])
+                        {
+                                $status = 'logout';
+                        }
+                }
+        }
+
+        $log_str = date('M d H:i:s').":: pma auth user='$user' status='$status' ip='".$_SERVER["REMOTE_ADDR"]."'";
+
+        $fp = fopen($LOG_FILE, 'a');
+        if ($fp === false)
+        {
+                //log to apache error log instead
+                error_log($log_str."\n");
+                return;
+        }
+
+        fwrite($fp, $log_str."\n");
+
+        fclose($fp);
+  }
 }