If you have multiple WordPress installations using the same database, this plugin makes it possible for one 
installation to run off the user table of another installation. Main user table selection is completely configurable 
through the options panel, and permissions of the users can be different from blog to blog.
When you switch the user table from one blog to another, all level 10 users (administrators) of the blog you are 
switching to are also made level 10 users on the blog in which you installed the plugin. Only a level 10 user can 
make the switch.
After you switch, you should visit the Users section of the Admin panel to setup permissions for all other users. 
They will be listed as “No role for this blog” in WordPress 2.3, or with an empty Role column under “All Users” in WordPress 2.5/2.6.
Note that ideally the blog you are switching should not have more than the default admin user. Content created by all other users 
will automatically be assigned to more or less random users from the main blog when you switch (based on <code>user_id</code>). Future versions 
of the plugin may support migrating existing users and content.

Shared Users

Have your blog run off the user table of another blog, in the same database.

johanee

Limit the number of login attempts possible both through normal login as well as using auth cookies.
By default WordPress allows unlimited login attempts either through the login page or by sending special cookies. This allows passwords (or hashes) to be brute-force cracked with relative ease.
Limit Login Attempts blocks an Internet address from making further attempts after a specified limit on retries is reached, making a brute-force attack difficult or impossible.
Features
<ul>
<li>Limit the number of retry attempts when logging in (for each IP). Fully customizable</li>
<li>Limit the number of attempts to log in using auth cookies in same way</li>
<li>Informs user about remaining retries or lockout time on login page</li>
<li>Optional logging, optional email notification</li>
<li>Handles server behind reverse proxy</li>
<li>It is possible to whitelist IPs using a filter. But you probably shouldn’t. 🙂</li>
</ul>
Translations: Bulgarian, Brazilian Portuguese, Catalan, Chinese (Traditional), Czech, Dutch, Finnish, French, German, Hungarian, Norwegian, Persian, Romanian, Russian, Spanish, Swedish, Turkish
Plugin uses standard actions and filters only.

Limit Login Attempts

bad role

We had initial issues and tried again and it is working better.

Getting a lot better.


I absolutely hate bloated plugins, so I love this one. It's simple and works as expected. Guess it's wise to use a plugin such as this one, against brute force attacks.



Guido


Love this plugin

Limit rate of login attempts, including by way of cookies, for each IP. Fully customizable.

Shared Users vs Limit Login Attempts