Pingbacks

My blog at http://intensecogitation.info seems to not have functioning pings. I tried to ping some of my test blogs but it didn’t seem to work. However when I used my test blogs to ping my blog, it worked.

I’ve already tried editing cron.php in wp-includes to lengthen the timeout, added the alternate cron define setting in wp-config.php and reduced the number of ping URLs. I’ve also tried disabling all plugins and trying without success.

Could you suggest any ideas for fixing pingbacks?