To integrate, in single sign-on, Joomla 1.5 and MediaWiki 2.1 I found an interesting plugin for joomla called "MediaWiki login" (or MediaWiki Bridge):
http://www.haroldprins.nl/index.php/mediawiki-bridge
Let's review the actors ...
- Joomla 1.5 (an existing working instance)
- MediaWiki 2.1 (a fresh instance)
- MediaWiki login (joomla plugin)
- AuthJoomla2 (mediawiki extension)
Following the simple guide provided from MediaWiki Bridge and installed the plugin and than the MW extension, however something went wrong.