I’ve just spent the last couple of hours trying to figure out why I couldn’t receive trackbacks on this site. As it turns out the issue lies with my hosting company (names.co.uk).
Their website states:
Vulnerabilities found in xmlrpc.php
Due to a large number of vulnerabilities found in the xmlrpc.php library supplied with a number of online scripts, we have decided to block access to any page with this name.While we have patched all the underlying libraries, we are disabling it until a more complete fix is found. If you are using xmlrpc.php, please update to the latest version and rename it.
Anyway, taking their advice I renamed the file and then changed the refrences to xmlrpc.php in both the new xmlrpc file (lines 31 through to 34) and in wp-includes/general-templates.php (lines 105 & 829), I then deleted out the old xmlrpc file and trackbacks are now working!
Additionally, I did come across a really good tutorial on http://www.optiniche.com which is step by step guide to trackbacks and how to use them.

August 30th, 2008 at 12:46 pm
Really appreciate people writing quality articles like this, many thanks!