Apache HTTPD : ETag Inode Information Leakage
This is an error that occurs during PCI scans. To remediate it, disable the ETag feature in your Apache configuration file.
Add FileETag None to /etc/httpd/conf/httpd.conf and restart your Apache server :
echo 'FileETag None' >> /etc/httpd/conf/httpd.conf
service httpd restart
Check if the ETag information are present in the http headers sent by your Apache server :
curl -I https://your_server_name/ -k