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Learn why DNS updates can take a while and how your internet provider or DNS service plays a role in the process. Understand why changes to DNS entries may not be instantly noticeable and how Time-To-Live for DNS changes affects this.

Learn how to update your server and installed packages regularly to enhance security and prevent execution of foreign codes on your server.

If you're running Debian 11 and encounter an error after running apt-get update because the repositories have changed from "stable" to "oldstable," don't worry. All you need to do is explicitly accept the changed suite value with the command: apt-get --allow-releaseinfo-change update. Afterward, you can resume using apt-get update, upgrade, and install as usual.