Problems with adding a blog to technorati

If you have this issue while adding your blog to technorati:
The proxy server received an invalid response from an upstream server. The proxy server could not handle the request POST /account/blogs/claimchoices.

Reason: Error reading from remote server

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

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Apache Server atwww.technorati.comPort 80

You might be able to solve this issue by not using a proxy server to claim your blog. On my site this error disappeared just after switching off my Privoxy.