Drupal: Webservice data cannot display in portal

Case:
We using php code to display webservice(.wsdl) data in drupal portal. But failed.. we get blank page. What happen??

Solution:

1. Check application log in portal server
   # tail -f /data/log/httpd-error.log
2. Increase max_execution_time limit in php.ini
   max_execution_time = 500
3. Increase memory_limit in php.ini
   memory_limit= 512M
4. Restart apache
   # /etc/rc.d/apache2  restart
   
   
   .