This is an annoying problem for some WordPress users. It’s a server configuration issue that can be overridden.
Unable to save Ping List
Unable to Save Remote Publishing Choices
Solution:
Add the following lines in your htaccess file in your root directory:
SecFilterInheritance Off
SecFilterEngine Off
SecFilterScanPOST Off
This should fix the problem.
Tags: Ping Problems, XML-RPC
