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 and then as per instructions given here
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: could not 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
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?
as ooshro below pointed out
netstat -tualp | grep \:www the output
I got was
tcp 0 0 localhost:www *:* LISTEN 2883/aolserver4-nsd