WAMP error: Forbidden You don't have permission to access /phpmyadmin/ on this server

Change the file content of c:\wamp\alias\phpmyadmin.conf to the following.

Note: You should set the Allow Directive to allow from your local machine for security purposes. The directive Allow from all is insecure and should be limited to your local machine.

<Directory "c:/wamp/apps/phpmyadmin3.4.5/">
    Options Indexes FollowSymLinks MultiViews
    AllowOverride all
        Order Deny,Allow
        Allow from all
</Directory>

Here my WAMP installation is in the c:\wamp folder. Change it according to your installation.

Previously, it was like this:

<Directory "c:/wamp/apps/phpmyadmin3.4.5/">
    Options Indexes FollowSymLinks MultiViews
    AllowOverride all
        Order Deny,Allow
    Deny from all
    Allow from 127.0.0.1
</Directory>

Modern versions of Apache 2.2 and up will look for a IPv6 loopback instead of a IPv4 loopback (your localhost).

The real problem is that wamp is binding to an IPv6 address. The fix: just add Allow from ::1 - Tiberiu-Ionuț Stan

<Directory "c:/wamp22/apps/phpmyadmin3.5.1/">
    Options Indexes FollowSymLinks MultiViews
    AllowOverride all
        Order Deny,Allow
    Deny from all
    Allow from localhost 127.0.0.1 ::1
</Directory>

This will allow only the local machine to access local apps for Apache.

Restart your Apache server after making these changes.

You have to just check whether your WAMP server is online or not.

To put your WAMP server online, follow these steps.

1. Go to your WAMP server notification icon (in the task bar).
2. Single click on the WAMP server icon.
3. Select last option from the menu, that is, Put Online
4. Your server will restart automatically (in the latest versions only). Otherwise, you have to restart your server manually.

And you are DONE...

If you're using WAMP with Apache 2.4.2 or greater, you need to use Require all instead of Allow and remove Order Deny,Allow:

<Directory "f:/Projects/myproject/www/">
    Options Indexes FollowSymLinks MultiViews
    AllowOverride all
    Require all granted
</Directory>

*as stated in this blog post