For installing Pgpool-Admin i am following the below link:- http://pgpool.projects.postgresql.org/pgpoolAdmin/doc/en/install.html But m stuck with one step that is: Step 7:The writing authority to pgmgt.conf.php is set to apache process user. cd /var/www/html/admin-tool/conf chown apache pgmgt.conf.php After this command :---- Showing me error: chown:invalid user apache I have installed Apache2 even my apache is also not running it is showing me error: After command for starting :/etc/init.d/apache2 start * Starting web server apache2 apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName (13)Permission denied: make_sock: could not bind to address 0.0.0.0:80 no listening sockets available, shutting down Unable to open logs Action 'start' failed. The Apache error log may have more information. plzzz do help.. -- View this message in context: http://postgresql.1045698.n5.nabble.com/problem-during-installation-of-pgpool-Admin-3-0-3-tp4734763p4734763.html Sent from the PostgreSQL - admin mailing list archive at Nabble.com. -- Sent via pgsql-admin mailing list (pgsql-admin@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-admin