Starting apache fails (could not bind to address 0.0.0.0:80)

Question

Update: Already fixed, it seems that one of VirtualHosts configurations files was wrong in sites-enabled.

I have Ubuntu 11.10

When I run the command to start

Answer 1

I fixed it by using below procedure. Run below command as root user.

root# ps aux |grep apache

It will show you Apache PID, just kill that PIDs and restart Apache Server.

Answer 2

It look like other process is using port 80.

$ netstat -anp | grep

eg. $ netstat -anp | grep 80

by above you get process name, if you want to use port then you need to stop the process or change the port

Answer 3

I had the same error, and just want to confirm that running

    sudo netstat -ltnp | grep ':80'

helped me indicate that Hiawatha webserver was in the way of Apache2.

Removing Hiawatha fixed the issue (sudo dpkg --purge hiawatha). Ubuntu 12.04.2 server.

Answer 4

You can only have listen PORTNUMBER in only one file of .conf. Do not put it in multiple files. Try it :)

Answer 5

It may be skype or nginx using the port 80.

Try shutting down skype, or running: sudo /etc/init.d/nginx stop

Answer 6

Try this, it works for me…

sudo netstat -ltnp | grep ':80'

This would return the following:

tcp6 0 0 :::80 :::* LISTEN 1047/apache2

Then

sudo kill -9 1047

Then I was able to restart Apache and everything was working fine.