WP_DEBUG
is a constant which you can define in wp-config.php
to disable hiding of PHP errors and notices.
Add define('WP_DEBUG', true);
to your config file to enable it.
Just remember to never leave it on for long on a live blog.
Since all pings fail this is likely not an issue with specific sitemap service, but with ping process itself. I think it might be HTTP requests failing for some reason, but there is no way to tell definitively from information you provided so far.
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