diff --git a/core/src/main/java/org/fao/geonet/kernel/security/openidconnect/GeonetworkOAuth2LoginAuthenticationFilter.java b/core/src/main/java/org/fao/geonet/kernel/security/openidconnect/GeonetworkOAuth2LoginAuthenticationFilter.java
index 87f72e70e62..e6734083386 100644
--- a/core/src/main/java/org/fao/geonet/kernel/security/openidconnect/GeonetworkOAuth2LoginAuthenticationFilter.java
+++ b/core/src/main/java/org/fao/geonet/kernel/security/openidconnect/GeonetworkOAuth2LoginAuthenticationFilter.java
@@ -66,7 +66,7 @@ protected void unsuccessfulAuthentication(HttpServletRequest request,
                                               HttpServletResponse response, AuthenticationException failed)
         throws IOException, ServletException {
         System.out.println("DEBUG HOME MADE GeonetworkOAuth2LoginAuthenticationFilter.unsuccessfulAuthentication");
-
+        failed.printStackTrace();
         super.unsuccessfulAuthentication(request, response, failed);
     }