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 had the same problem

For me, apache was already running but it was running the wrong way.

Killing processes didnt work because a daemon kept reinstantiating it.

apachectl stop   

resolved the issue.

Answer 2

Go to device manager, select “show hidden devices” from menu/view, go to “Non-Plug and Play Driver”/HTTP, double click it to disable it (and disable or manual some services depended on it). Reboot and enjoy!

Answer 3

Worked for me running this command:

fuser -k -n tcp 80

Answer 4

This will happen because of repeated installation of apache or port is using by another service

sudo lsof -i | grep "httpd"

You will find process id and listening port of service. Then check

cd /proc/(process id of http)

Then kill that process using command

kill -9 pid

now

sudo netstat -nltp

again kill the process

syntax:-

kill -9 pid

and now start apache

sudo ./apachectl start

Answer 5

What I would do is simply check if the following is set in your /etc/apache2/sites-available/your-domain-name.com.conf

SSLEngine on 
SSLCertificateFile /your/path/to/your-domain.com.crt
SSLCertificateKeyFile /your/path/to/your-domain.com.key
SSLCACertificateFile /your/path/to/your-domain.com.ca-bundle

and there aren't any mistyped directories or anything else that would not supposed to be in your .conf file. It did the trick for me as re-starting and killing the processes did not help at all. It did not start anyway.

Answer 6

use either

sudo killall httpd

or

sudo killall apache2

check if some one using the 80 port

sudo netstat -tulpn| grep :80

The restart

sudo service httpd start

then restart the server.It took me a whole day to understand the issue