Problema
Ao acessar http: // localhost / phpmyadmin:
Forbidden
You don't have permission to access /phpmyadmin/ on this server.
Solução
Altere a configuração de controle de acesso do Apache :
Order allow,deny
Allow from all
para:
Require all granted
Referência
http://httpd.apache.org/docs/2.4/upgrading.html#access