I am using a Ubuntu virtual machine.Where I installed OpenACS which depends upon AOLServer. To do so I had first shutdown Apache on this machine. Then following instructions given here http://openacs.org/xowiki/ubuntu Step 1) aptitude install postgresql Step 2) aptitude install openacs I had to shutdown Apache to do above installation. Now the installation finishes.So I can access http://localhost:8000 but when ever I try to start Apache on this machine which was shutdown during installation I see the error service apache2 start * Starting web server apache2 (98)Address already in use: make_sock: couldnot bind to address 0.0.0.0:80 no listening sockets available, shutting down Unable to open logs So I thought may be OpenACS installs AOLServer so Aolserver might be listening on port 80 I check /etc/aolserver4/conf.d/ openacs.sh and here AOL_USER=www-data AOL_GROUP=www-data AOL_ADDRESS=192.168.1.15 AOL_PORT=8000 RUN_DAEMON=yes So AOLServer is not listening on port 80 upto here it is confirmed. netstat -tualp | grep 80 tcp 0 0 somemachine.somedimain.:8000 *:* LISTEN 21321/aolserver4-ns so netstat shows only 8000 in use. Then why am I unable to start Apache in this case? service apache2 start * Starting web server apache2 (98)Address already in use: make_sock: couldnot bind to address 0.0.0.0:80 no listening sockets available, shutting down Unable to open logs --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx