One-time setup · per device

# Secure Connection Setup

UBUNTUPLAY CLASSROOM · OFFLINE HTTPS

This classroom server creates its own security certificate so games work over HTTPS without internet. Your browser doesn't know this certificate yet, so it may show a warning the first time. You have two options:

## Option 1 — Quick (just proceed once)

On the warning page tap Advanced → Proceed / Continue to site. Your browser remembers the choice on this device.

Continue to Games →

You'll be taken to the secure address automatically.

## Option 2 — Recommended (install the certificate, no warnings ever)

Download Certificate

File: `ubuntu-play-classroom.crt` — then follow the steps for your device:

Android tablet / phone

1. Open the downloaded file, or go to Settings → Security → Encryption & credentials → Install a certificate → CA certificate.
2. Choose Install anyway and select the downloaded file.
3. Done — reopen the browser and the warning is gone.

Windows laptop

1. Double-click the downloaded file and choose Install Certificate…
2. Select Local Machine (or Current User) → Place all certificates in the following store.
3. Browse to Trusted Root Certification Authorities → Next → Finish.
4. Restart the browser.

iPad / iPhone

1. Download the certificate in Safari, then open Settings → Profile Downloaded → Install.
2. Then go to Settings → General → About → Certificate Trust Settings and enable full trust for UbuntuPlay Classroom.

Chromebook

1. Open `chrome://settings/certificates` → Authorities tab → Import.
2. Select the downloaded file and tick Trust this certificate for identifying websites.

Linux laptop

1. Firefox: Settings → Privacy & Security → Certificates → View Certificates → Authorities → Import.
2. Chrome: `chrome://settings/certificates` → Authorities → Import.

Teachers: this page is always available at `http://this-server/trust` — share it with any device that shows a warning.