This pingback issue had been driving me crazy. For several days now, I had been troubleshooting my Wordpress installation to check why I am not able to send pingbacks. I spent several hours scouring the internet for any kind of solution. Looks like a lot of people were having the same problem.
After doing everything in my power to find a solution, I waved my white flag and succumbed to the one stop remedy to everything – a fresh install. After the infamous 5 minute installation and ‘hassle’ free set ups of the plugins, themes, et al, everything seems to be working fine. I have spammed several pingback and trackback tester pages just to check.
So, what was the issue? The culprit is either 1) the All-in-one-SEO-Pack plugin, 2) the previous theme or 3) both of them. I didn’t really test all the plugins one by one. However, one guy was able to solve the issue just by adjusting one setting in the All-in-one-SEO-Pack plugin. I figured, why not just get rid of it. As for the theme, well, I like this one better.
So if you managed to reach this site looking for a nifty solution to this pingback problem, well, sorry, can’t advise you anything but to do that fresh install. If you do have any insights feel free to share. I sure do want to know what was causing this.

here’s me testing my comments. =P
Glad to see that, some one else also had the same problem
I had also reinstalled the plugin’s, theme and WordPress. But nothing was working, until I changed the settings in All-in-one SEO plugin. Strange, but true!
Your theme is good looking. I like minimalistic theme designs.
Yeah, I was thinking that the plugin might have contributed to it. Though, we still don’t have any viable root cause for this. If I had the time I would probably investigate the issue. But as it is, I am already satisfied that pingback is somehow working.
Thanks. I wished I had designed it. Minimalist themes are really nice to look at.
Clarisse,
Your pingback seems to be working fine. I got your pingback in my site.
Thanks for confirming. And I checked your site and also saw it posted.
Your blog gave me the hint for a solution to another issue with 2.7.1 – “Comments” would not show on the page, I deactivated All-IN-One-SEO and VIOLA! There they are! Thanks for the information.
-Jim
Glad that I was able to sort of help.