[BRotondi]

I skipped the red step above and tested what I've done yet:
- vBulletin still works
- wiki first not, but the problem was obvious:

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Warning: require_once(/sinnimleben.net/forum/global.php) [function.require-once]: failed to open stream: No such file or directory in /home/.lukey/br_noreply/sinnimleben.net/wiki/includes/AuthPlugin_vBSSO.php on line 257

Fatal error: require_once() [function.require]: Failed opening required '/sinnimleben.net/forum/global.php' (include_path='/home/.lukey/br_noreply/sinnimleben.net/wiki:/home/.lukey/br_noreply/sinnimleben.net/wiki/includes:/home/.lukey/br_noreply/sinnimleben.net/wiki/languages:.:/usr/local/php5/lib/php:/usr/local/lib/php') in /home/.lukey/br_noreply/sinnimleben.net/wiki/includes/AuthPlugin_vBSSO.php on line 257
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I realized that the FTP-Path seems not to be the same like the server path. So I changed in STEP 1
define( VB_SYSTEM_PATH, '/sinnimleben.net/forum' );
to
define( VB_SYSTEM_PATH, '/home/.lukey/br_noreply/sinnimleben.net/forum' );

Now Wiki works , have to test the Hack itself

But this is also unclear: Now my users will have to register only in wiki or only in VB?

Thanks!
Bruno