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MozOut - United States www.my.mozout.com › My MozOut › Knowledge Base Knowledge baseE-mail

Error 421 and 451: temporary failures, and why the message is delayed and not lost

An error that starts with a 4 (421, 450, 451, 452) is a “not now, try later” reply. It is not a refusal. The server that sent the message keeps…

MozOut - United States www.my.mozout.com › My MozOut › Knowledge Base Knowledge baseDatabases

Installing PostgreSQL on a VPS

On a VPS running Ubuntu 22.04 LTS, as root, you install PostgreSQL with apt install postgresql postgresql-contrib. The service starts by itself and, by default, listens only on the server…

MozOut - United States www.my.mozout.com › My MozOut › Knowledge Base Knowledge basePHP & Development

A blank page in PHP: how to see the error

A white page means PHP hit a fatal error and is set not to show it. That is the right setting for a public site, which is why the error…

MozOut - United States www.my.mozout.com › My MozOut › Knowledge Base Knowledge baseAutomation & n8n

A scheduled report by e-mail: a script, a cron job and an SMTP account

To get a summary of the site in your e-mail every morning (the day’s orders, enquiries received, new sign-ups) you need three pieces: a PHP script that fetches the figures…

MozOut - United States www.my.mozout.com › My MozOut › Knowledge Base Knowledge baseBackups & Migration

I deleted a file or folder by mistake: how to get it back from a backup

If you deleted a file or a folder, getting it back is almost always quick and does not need a restore of the whole account. First look in the File…

MozOut - United States www.my.mozout.com › My MozOut › Knowledge Base Knowledge baseChoosing the Right Plan

Preparing for a traffic spike: a campaign, a launch or a live event

A traffic spike is not solved on the day: it is solved in the days before. What brings a site down in a campaign is not the total number of…

MozOut - United States www.my.mozout.com › My MozOut › Knowledge Base Knowledge baseNode.js, Python & Docker

Django DisallowedHost, CSRF failed and missing static files: the fixes

You put Django online and three errors show up that nearly everyone meets: DisallowedHost, CSRF verification failed and the page with no styles (static files give a 404). They have…

MozOut - United States www.my.mozout.com › My MozOut › Knowledge Base Knowledge baseComparisons and alternatives

InnoDB or MyISAM: which storage engine, and what to do with an old table

Use InnoDB. It is the default engine of the MariaDB that runs on our hosting, it copes better with failures and simultaneous writes, and it is what current applications expect.…

MozOut - United States www.my.mozout.com › My MozOut › Knowledge Base Knowledge baseSecurity

Security headers explained: what they do and how to add them in .htaccess

The short answer: security headers are small instructions your site sends the browser with every page (“do not let anyone put me inside another site”, “do not guess the type…

MozOut - United States www.my.mozout.com › My MozOut › Knowledge Base Knowledge baseBackups & Migration

Leaving a hosting provider: how to take everything with you before you cancel

Before you cancel, take five things: the site files, the databases, the e-mail, the list of DNS records, and the list of settings that are not in the files (PHP…