Google login works but using the Wordpress OpenID plugin or MyOpenid the validate() function fails.
<?php
require 'openid.php';
$openid = new LightOpenID('domain.netaction.de');
if(isset($_POST['openid_identifier'])) {
$openid->identity = $_POST['openid_identifier'];
header('Location: ' . $openid->authUrl());
}
if ($openid->validate()) echo 'Accepted OpenID: '.$openid->identity;
?>
<form action="" method="post">
OpenID: <input type="text" name="openid_identifier" /> <input type="submit" />
</form>