Roiki wrote:

Hello there, Could I make mediawiki private? That is:

• Could I set, only registered-user may read and edit the pages? And maybe, membership must be approved by webmaster or sysop.

http://meta.wikimedia.org/wiki/Preventing_Access

• Could mediawiki be set so only local connection may connect to mediawiki, (i.e., http://127.0.0.1/mediawiki/index.php/Main_Page )
• or any other methods to make the page more secure and private.

You could add a check for this in your LocalSettings.php.

-- brion vibber (brion @ pobox.com)