WordPress MU

Hi ,

I am trying to use a proxy server to communicate to the outside world. I have set up the proxies in the WP-config file. but i still get the errors in the dashboard.

Wp-config.php

define('WP_PROXY_HOST', 'squid.crsc4.e-centives.com');
define('WP_PROXY_PORT', '3128');
define('WP_PROXY_USERNAME', '');
define('WP_PROXY_PASSWORD', '');
define ('WP_HTTP_BLOCK_EXTERNAL', 'false');

error i see in dashboard.
WP HTTP Error: User has blocked requests through HTTP.

Any help is greatly appreciated.