Log of access.log file of apache when i was browing. 127.0.0.1 - - [18/Jul/2011:07:49:52 -0400] "GET /GNDEC-SMS-Service/ HTTP/1.1" 500 274 "-" "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.3) Gecko/20100423 Ubuntu/10.04 (lucid) FireDownload/2.0.1 Firefox/3.6.3" Log of error.log file: [Mon Jul 18 07:49:50 2011] [notice] Apache/2.2.14 (Ubuntu) PHP/5.3.2-1ubuntu4.9 with Suhosin-Patch configured -- resuming normal operations [Mon Jul 18 07:49:52 2011] [error] [client 127.0.0.1] PHP Warning: require_once(/var/www/GNDEC-SMS-Service/config.php): failed to open stream: Permission denied in /var/www/GNDEC-SMS-Service/constants.inc on line 61 [Mon Jul 18 07:49:52 2011] [error] [client 127.0.0.1] PHP Fatal error: require_once(): Failed opening required 'config.php' (include_path='.:/usr/share/php:/usr/share/pear') in /var/www/GNDEC-SMS-Service/constants.inc on line 61 See if anything can work now. Let me tell you it is working fine on my friends system.I have newly installed ubuntu and updated it. Thanks you all <a href="http://amritpalpathak.blogspot.com">amritpalpathak.blogspot.com</a>