Important note to Drupal 5 and Drupal 6 users (part two)

Last week, a configuration error on the Mollom servers caused a bug in Drupal 5 and Drupal 6 to surface which prevented sites from automatically reconnecting to the Mollom servers.

We identified a bug in the Drupal 5 module of Mollom, and released a fix for it earlier this week. We notified people about this through e-mail and on our blog.

What we hadn't discovered at the time was an additional bug in the error-handling code of the XML-RPC libraries in Drupal core. Special thanks to Joshua Brauer of Acquia Support for debugging this problem and bringing it to our attention.

In other words, the notification that we published earlier was incomplete and additional action is required for both Drupal 5 and Drupal 6 users.

We have since fixed the bug in Drupal 5 and Drupal 6 core, and this week, Drupal 6.14 and Drupal 5.20 were released. If you want to fix this problem for real, we highly recommend that you upgrade your Drupal installations to Drupal 5.20 or Drupal 6.14.

Note that Mollom has two fallback modes when no servers can be reached: "do not block spam" and "do not allow posts from protected forms". The module's default fallback setting is "do not allow posts from protected forms". Some customers may be unaware that Mollom spam blocking is presently disabled on their site.

If you can't instantly upgrade, the quick work around for both Drupal 5 and Drupal 6 users is to visit your Mollom module configuration page, which has a side-effect of automatically resetting the list of Mollom servers. You'll know this has worked when you receive a confirmation message at the top of the page which says, "We contacted the Mollom servers to verify your keys: the Mollom services are operating correctly. We are now blocking spam.".

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