SELinux can be such a nuisance. In particular, if you have a newly created file system, you will need to add labels to it, also known as SELinux security contexts.
[Updated 2022-11-30] This post explains how to set up robust security headers in NGINX to protect your web application from malicious payloads and other forms of attacks. Choose your HTTP(S) headers wisely.
Problems signing in to AWS? When the login page “Sign in as IAM user” repeatedly says: “Your authentication information is incorrect. Please try again” though you entered correct information, your Gemalto token generator for MFA authentication could be out of sync.
Who wants to issue certificates manually if they can take Letsencrypt’s Certbot to the task.