# Test, repair and reboot a server

Check that Nuvlo can still connect to a server, repair the connection, install extra system packages, and reboot the server safely.

## Step 1: Open Maintenance

Open the server and click the **Settings** tab. The **Maintenance** card is at the top. Its badge shows **Operational** or **Needs attention**.

![The Maintenance card with the Server software, SSH connection, Headless browser support and Reboot server rows](https://app.nuvlo.dev/docs/shots/server-maintenance--maintenance-card.webp)

## Step 2: Test the connection

In the **SSH connection** row, click **Test connection**. **Connected — Nuvlo can manage this server** means everything works. Otherwise the message says why the connection failed.

## Step 3: Repair the connection (Hetzner)

On Hetzner servers, click **Repair connection** if the test fails. Nuvlo inspects its management key on the server and replaces it if needed. Your sites' deploy keys aren't changed. You need the owner or admin role.

Repairing can restart the server. If it can't fix the connection on its own, the card shows the steps to take, a **Rescue password (works once)** and the key to add. Keep the page open until you've finished.

## Step 4: Install extra system packages

**Headless browser support** installs the libraries Chromium needs to run without a screen. Apps that render PDFs or screenshots on the server, for example with Puppeteer or Playwright, need it. Click **Install packages** and confirm. Once installed, the row shows **Installed** and the button reads **Reinstall packages**.

## Step 5: Reboot the server

In the **Reboot server** row, click **Reboot server**, then the **Reboot** button with the server's name. Every site on the server goes offline while the operating system restarts.

![The Reboot server confirmation dialog with the Reboot button naming the server](https://app.nuvlo.dev/docs/shots/server-maintenance--reboot.webp)

The dialog then shows the time since the reboot started; reboots usually take 30 to 60 seconds. It shows **Server is back online!** when the server answers again.

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Source: https://app.nuvlo.dev/docs/server-maintenance