xmlrpc.com is a WordPress file that was intended to be used for API’s but lately it’s more and more used as a way for hackers to brute-force WordPress installations.
To block access to xmlrpc.php on a single WordPress installation add the following code to your .htaccess file:
# Block XML-RPC <Files xmlrpc.php> order deny,allow deny from all allow from 127.0.0.1, </Files> # END WordPress