I am using shared sign on module and when it is enabled I get a error when using Drush module saying 

Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /opt/drush/includes/drush.inc:439) in /var/www/includes/bootstrap.inc on line 1029

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /opt/drush/includes/drush.inc:439) in /var/www/includes/bootstrap.inc on line 1029

However, when I disable shared sign on drush works fine. Could someone help solve this problem.

I have also posted this here: http://drupal.org/node/445102