Vá para C:\wamp\alias e edite o arquivo phpmyadmin
# to give access to phpmyadmin from outside
# replace the lines
#
# Order Deny,Allow
# Deny from all
# Allow from 127.0.0.1
#
# by
#
# Order Allow,Deny
# Allow from all
# to give access to phpmyadmin from outside
# replace the lines
#
# Order Deny,Allow
# Deny from all
# Allow from 127.0.0.1
#
# by
#
# Order Allow,Deny
# Allow from all