diff --git a/authentication.php b/authentication.php
index 0183d0d..26c0395 100644
--- a/authentication.php
+++ b/authentication.php
@@ -172,13 +172,14 @@ class authentication
   /** Check all the REST API */
   public function verifAuthREST ()
   {
+    if ($this->debug)
+      echo "=== entering verifAuthREST (restMethods=".
+        print_r ($this->restMethods, true).")\n";
     $authparams = new \authparams ($this->restMethods);
     $res = array ("email"=>"anonymous", "password"=>"anonymous");
     if ($authparams->email !== "anonymous" &&
         $authparams->password !== "anonymous")
     {
-      if ($this->debug)
-        echo "verifAuth ($authparams->email, $authparams->password)\n";
       $res = $this->verifAuth ($authparams->email, $authparams->password);
     }
     if (! is_array ($res))
@@ -196,7 +197,9 @@ class authentication
   /** Check all the others pages of the site */
   public function verifAuthHTML ()
   {
-    if ($this->debug) echo "verifAuthHTML() : ";
+    if ($this->debug)
+      echo "=== entering verifAuthHTML (htmlMethods=".
+        print_r ($this->htmlMethods, true).")\n";
     $authparams = new \authparams ($this->htmlMethods);
     // Don't ask to the provider if anonymous is known
     if ($authparams->email === "anonymous" || $authparams->email === null)
@@ -230,19 +233,26 @@ class authentication
               an exception if noting is found */
   private function verifAuth ($email, $password)
   {
+    if ($this->debug)
+      echo "Entering in verifAuth ($email, xxxxxxxx)\n";
     if (! is_array ($this->authMethods) || count ($this->authMethods) === 0)
       throw new \Exception ("No authentication method defined", 500);
-    if (isset ($_SESSION["domframework"]["authentication"]["lastcheck"]) &&
+    if ($this->debug < 2 &&
+        isset ($_SESSION["domframework"]["authentication"]["lastcheck"]) &&
         $_SESSION["domframework"]["authentication"]["lastcheck"] + 180 <
           time ())
     {
       // Test the authentication each 3 minutes if there is a session, else
       // return the previous values
+      if ($this->debug)
+        echo "verifAuth : using auth cache (push in debug=2 to skip)\n";
       return $_SESSION["domframework"]["authentication"]["authcache"];
     }
 
     foreach ($this->authMethods as $method)
     {
+      if ($this->debug)
+        echo "Authentication method=$method\n";
       if (! is_string ($method))
         throw new \Exception ("The authentication method is not a string", 500);
       $classname = "auth$method";
@@ -256,6 +266,9 @@ class authentication
       {
         $this->authServers[$classname] = array ($this->authServers[$classname]);
       }
+      if ($this->debug >= 2)
+        echo "Authentication method=$method : authServers=".
+          var_export ($this->authServers[$classname])."\n";
       if (! is_array ($this->authServers[$classname]) ||
           count ($this->authServers[$classname]) === 0)
         throw new \Exception ("No authentication server defined for method ".
@@ -270,6 +283,8 @@ class authentication
         $authmethod = new $classname ();
         foreach ($serversParam as $param=>$value)
         {
+          if ($this->debug)
+            echo "Add param '$param' with value '$value' to auth$method\n";
           $authmethod->$param = $value;
         }
         $authmethod->connect ();