Knowledge Base

Fixes from the people who fix servers.

Step-by-step runbooks written by our engineers for the problems we see most often. Each one shows you how to find the cause, fix it, and confirm it's fixed. If you'd rather not do it yourself, we're a phone call away.

Linux

Linux Disk Full: Find What's Using Space and Free It Safely

How to find what's filling a Linux server's disk with df, du and lsof, and safely reclaim space from logs, caches, old kernels and deleted-but-open files.

Intermediate · Reviewed Oct 2026

Windows Server

Fix "No Remote Desktop License Servers Available" on Windows Server

Why Remote Desktop users get disconnected because no RD license servers are available, and how to configure RDS licensing, CALs and the licensing mode correctly.

Intermediate · Reviewed Oct 2026

WordPress & Web

Fix "Error Establishing a Database Connection" in WordPress

Step-by-step diagnosis for the WordPress database connection error: checking credentials, the database service, memory, disk space, corrupted tables and connection limits.

Intermediate · Reviewed Oct 2026

Fix 502 Bad Gateway on Nginx with PHP-FPM

Diagnose and fix Nginx 502 Bad Gateway errors caused by PHP-FPM being down, socket path mismatches, permissions, SELinux, or exhausted pm.max_children.

Intermediate · Reviewed Oct 2026

Email & DNS

Emails Going to Spam? Set Up SPF, DKIM and DMARC Correctly

How to check and fix SPF, DKIM and DMARC DNS records so your business email, and email sent by your website, lands in the inbox instead of spam.

Beginner · Reviewed Oct 2026

Security

Has My Linux Server Been Hacked? A Compromise Checklist

A step-by-step checklist for spotting a compromised Linux server, covering logins, processes, network connections, cron jobs, SSH keys and modified files, and what to do if you find one.

Advanced · Reviewed Oct 2026

Rather we just handled it?

With proactive server management, we catch most of these problems before they ever reach you.

See server management