“Precondition failed” error in WordPress

Errors suddenly appeared on this blog in the last day or so.

Precondition Failed

We’re sorry, but we could not fulfill your request for [...] on this server.

This error was only affecting IE users.

It turns out the problem was the anti-spam plugin for WordPress called “Bad Behaviour”. I have disabled the plugin and all should be fine now. Funny that it started suddenly like that. I don’t think I made any relevant changes in the last few days.

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