OpenID Provider [REGARDED AS SOLVED]
Fragment of a discussion from Extension talk:OpenID
Solution: in your LocalSettings.php set
$wgOpenIDClientOnly = false; // false means: allow to act not only as client, but also as OpenID server (you wanted this) $wgOpenIDAllowServingOpenIDUserAccounts = true; // check, if you want this. For tests, set this to true
The article page and the README explain the meaning of all switches.