3om3: there's a few things you can do:
1. Check the WP plugins repository. There's a couple of plugins that let you disable it. Here's one of them:
https://wordpress.org/plugins/disable-xml-rpc-pingback/
2. Set up an .htaccess <files> directive to restrict access to xmlrpc.php
Code:
<Files "xmlrpc.php">
Order Allow,Deny
deny from all
</Files>
3. Edit your wp-config file to disable it.
http://wpengineer.com/2484/xml-rpc-e...wordpress-3-5/