Start activating the multi-site features of WordPress 3.0 by adding this line of code to your wp-config.php file:

/** Enable or disable Worpress Multi-site features **/
define('WP_ALLOW_MULTISITE', true);

Refresh your Dashboard and got to ”Tools -> Network”. You will see a screen that looks similar to the one in the picture below:

If you want to install your additional blogs on virtual sub-domains instead of sub-directories you will need to create a wildcard DNS record on your server to enable the sub-domain (blog1.yourdomain.com, blog2.yourdomain.com, blog3.yourdomain.com) functionality of WordPress 3.0.

Your server must support wildcard DNS records for you to do this. As an example I will explain how to configure it with Hostgator. It’s very easy to do with the Hostgator Baby Plan allows them. When you are in your Hostgator Control Panel, follow these instructions to create a wildcard DNS record for a domain.

Select “sub-domains” under”Domains” in CPanel
Enter an asterisk “*” in the sub-domain’s name field
Select the TLD the wildcard DNS is to be set up on
Enter the server location address for the wildcard folder, e.g. /public_html/bigbuz
Click “Create”
Back to your WordPress admin panel, you need to install the now activated WordPress 3.0 Network settings, viz

Find the Network settings page in your WordPress admin panel (Tools>Network)
Choose whether you want to use sub-domains or sub-folders for the additional blogs
Type a name for your network of sites
Set your admin email address
Click “Install”

After a minute or two you will be presented with a configuration screen. Back up your .htaccess and wp-config.php files before you proceed to follow the instructions provided on that configuration screen.

As a precautionary measure to prevent visitors of non-existent sites from being greeted by 404 error messages, redirect them to a URL of your choice by adding the below code to the bottom your wp-config.php file:

 /* Send visitors to non-existent blogs here */
define( 'NOBLOGREDIRECT', 'http://yourdomain.com/' );

Change http://yourdomain.com to the URL of your choice

Log out then log back in.
You will now need to go through your settings to enable or disable the new options provided by WordPress Multi Site.

Upgrading from WPMU to WordPress Multisite 3.0

If you are upgrading from WPMU to WordPress Multisite 3.0, you can do it automatically from the dashboard, but some manual configuration is also needed. After you upgrade and you login again into the dashboard, this message will be displayed:

Warning! WordPress encrypts user cookies, but you must add the following lines to wp-config.php for it to be more secure.

Follow the steps listed there and then you could see something like this:

“Thank you for Updating! Please visit the Update Network page to update all your sites.”

Follow the link and update all the blogs. (If you have any). Update Network.

Also you could see the following message:

“The wp-content/blogs.php file is deprecated. Please remove it and update your server rewrite rules to use wp-includes/ms-files.php instead.”

So, just remove the blogs.php file from the server and edit your .htaccess file. The .htaccess file can be found in the root folder, where the wp-config.php file is.

Open with notepad and change:

RewriteRule ^([_0-9a-zA-Z-]+/)?files/(.+) wp-content/blogs.php?file=$2 [L]

to

RewriteRule ^([_0-9a-zA-Z-]+/)?files/(.+) wp-includes/ms-files.php?file=$2 [L]

Done! Your new Multiuser 3.0 installation is ready to use.

Enjoy!

For example, if you want bbPress to display on “yourdomain.com/forums”, you should create a folder called “forums” in the root directory.  Take a look at the graphic below of the FTP folder created with the name “forums”.

Inside the folder called forum, we placed all bbpress content and files. Remember, the name of the directory must be the name where the forum will be placed. This step is very important, since you can’t change it after in the installation.

So, upload everything inside this directory. Then open the url to install and activate bbPress, in this case the url is ”wpthemesplanet.com/forums”. Then the installation steps will be displayed in your browser. Just follow the steps, enter your DB user and pass, in step 1. In step 2 you have the option to integrate wordpress with bbpress. I personally skipped this step, since you can always integrate WordPress later from within the admin area of bbPress.

Pay attention to step 3, press on the thumb below for a bigger screenshot. Where it says site address, make sure you write the address with the same folder name you used before. For example we used “forums” for our bbpress folder, then you should use “forums” here too. In this case “wpthemesplanet.com/forums”. If you use a different name, you may find a lot problems later.

Most tutorials I found on the web don’t explain this step very well and users might experience technical problems later, so make sure you respect this point. Should you have any questions make sure you leave a message below or contact us.

Happy wordpressing.

I won’t name them as it’s Unprofessional to do. You can contact me if you need more info or if you need me to review your premium themes. Anyway, many webmasters buy those themes, because the themes are actually sold using excellent marketing tactics that make people buy them. However take care before wasting money on wordpress themes that are not going to fit your basic needs or will fail to integrate with the latest WordPress Versions. And when you ask for support, they don’t give you any at all.  Now I am very happy to say that both Themes I designed are fully compatible with WordPress MU and with the latest versions of WordPress. I’m currently working on new themes. I will release a very good free theme soon. Something that cannot be found on the market actually. Something fresh and original. So stay tuned.

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The main changes in this release are:

_A fix for the Trackback Denial-of-Service attack that is currently being seen.
_Switched the file upload functionality to be whitelisted for all users including Admins.
_Removal of areas within the code where php code in variables was evaluated.
_Retiring of the two importers of Tag data from old plugins.

We recommend that all your sites are upgraded to this new version of WordPress to ensure that you have the best available protection. You can upgrade in seconds, using the One Click upgrade installation, directly from your Dashboard.

If you think your site may have been hit by one of the recent exploits and you would like to make sure that you have cleared out all traces of the exploit then we would recommend that you take a look at the WordPress Exploit Scanner. This is a plugin which searches the files on your website, and the posts and comments tables of your database for anything suspicious. It also examines your list of active plugins for unusual filenames. You can read more about this plugin here – “WordPress Exploit Scanner”.

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