Following discussions at the WordPress support forums, bug #1713, the bug was fixed by Changset #2933 In simple English, WordPress confirms pingbacks with a blank user-agent. The latest version of Bad Behavior blocks sites with send a blank user agent, as this is a common technique being used by spammers to get through user agent filters. I faced a similar problem with Silktide and added their IP to the whitelist.
Weblogs.com has be bought by Verisign, which means yet another Ping service has been taken over by a big corporate company. This follows after Blo.
The last two days have seen long page loads along with temporary downtime at WordPress.com Well things seem to be back on track now. Though I do have a feeling that an older backup was used, because I seem to have lost a comment on my post below.
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Have had some time to evaluate WordPress.com since I signed up two days ago. Signing up was rather easy without having to fill in too much details.