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

When I use service httpd restart, the server prompts:

Starting httpd: (98) address already in use: make_sock: cocould not bind to address [:]: 80 (98) address already in use: make_sock: cocould not bind to address 0.0.0.0: 80 no listening sockets available, shutting down

Port 80 is used again.

I have checked some areas and recommended them:

$ Sudo Fuser-K-n tcp 80
$ Sudo/etc/init. d/httpd-K start

In the httpd. conf file, there is a saying:

Listen *: 80. you can comment out this sentence. No tests