Description:
hi there, was wondering if you could help me with this error i am getting. i was trying to restart my apache server on my linux machine when i got this error i have never seen before, can anyone tell me what this error means? 

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# /etc/init.d/httpd restart

Stopping httpd:                                            [  OK  ]

Starting httpd: (98)Address already in use: make_sock: could not bind to address [::]:80

(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

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Cause:
This problem is caused by another service listening to TCP/IP port 80.

Solution:
1. $ sudo fuser -k -n tcp 80
$ sudo /etc/init.d/httpd start
2. Change the listen port in the httpd config file to 81, by doing this we want to see which service is using port 80.
just do the following command as root :
#netstat -tlp
after running the command.
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name 
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1546/sshd 
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 1429/cupsd 
tcp 0 0 127.0.0.1:5432 0.0.0.0:* LISTEN 1592/postmaster 
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 2360/sendmail: acce 
tcp 0 0 0.0.0.0:8554 0.0.0.0:* LISTEN 3207/gnome-dvb-daem 
tcp 0 0 0.0.0.0:54858 0.0.0.0:* LISTEN 1369/rpc.statd 
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 1310/rpcbind 
tcp 0 0 :::59092 :::* LISTEN 1369/rpc.statd 
tcp 0 0 :::22 :::* LISTEN 1546/sshd 
tcp 0 0 ::1:631 :::* LISTEN 1429/cupsd 
tcp 0 0 :::443 :::* LISTEN 2593/httpd 
tcp 0 0 :::6881 :::* LISTEN 2757/ktorrent 
tcp 0 0 :::111 :::* LISTEN 1310/rpcbind 
tcp 0 0 :::80 :::* LISTEN 2593/httpd 
tcp 0 0 :::81 :::* LISTEN 2593/httpd 

now we know that port 80 is utilised by another service, so locate and change system-config-httpd.conf: system-config-httpd.conf system-config-httpd.conf. all of this, restart httpd:
/etc/init.d/httpd start

3. Third solution is to change binging address in your httpd.conf like this: 
Listen 127.0.0.1:80 ( that means:  instead of  Listen 0.0.0.0:80)

转自：http://3550334.blog.51cto.com/3540334/787526