CentOS 8.x apache troubleshooting

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Apache fails to start with unable to bind to port 443

It is possible that apache fails to start with unable to bind to port 443 error. In such cases if we look at

ss -alnpt | grep 443

We can see which program is listening on port 443 already and try to stop it. However, it is possible to receive this error even when:

• There is no program listening on port 443
• There is no SELinux based blocking
• You are trying to start apache as root user (Not related to Linux permissions for port numbers less than 1024).

It was found that this can happen when there are multiple:

Listen 443

at different places in apache configuration. For example one such line could be there in custom SSL certificate configuration file and one such could be there in /etc/httpd/conf.d/ssl.conf.

Hence to look for duplicate "Listen 443" use:

cd /etc/httpd
grep -r -i "listen" conf conf.d

If you find "Listen 443" at more than one place and then one of them needs to be commented to be able to start properly.

Refer:

• https://forums.cpanel.net/threads/apache-failing-to-start-unable-to-bind-to-port-443.292052/

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