Cannot load /usr/lib64/apache2/modules/mod_proxy.so into server: /usr/lib64/apache2/modules/mod_proxy.so: undefined symbol: ap_get_pollfd_from_conn

Symptoms

When restarting the httpd service, you encounter an error similar to the following.

restartsrv_httpd[55834]: httpd: Syntax error on line 28 of /etc/apache2/conf/httpd.conf: Syntax error on line 2 of /etc/apache2/conf.modules.d/280_mod_proxy.conf: Cannot load modules/mod_proxy.so into server: /etc/apache2/modules/mod_proxy.so: undefined symbol: ap_get_pollfd_from_conn

Description

The error occurs when one or more files provided by the ea-apache24 package are corrupt or missing.

Workaround

1. Access the server's command line as the 'root' user via SSH or "Terminal" in WHM.
2. Reinstall the ea-apache24 package.
   • CentOS 7, CloudLinux 7

     yum reinstall ea-apache24

   • AlmaLinux 8/9, CloudLinux 8/9, Rocky Linux 8/9

     dnf reinstall ea-apache24

   • Ubuntu

     apt install --reinstall ea-apache24