# Fixing Internet Problems

If your classroom network is not working, follow these steps to fix common issues. If you still have trouble, check the [**Wi-Fi Setup Guide**](./) to ensure everything is connected correctly.

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### Quick Check List

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### 1. Restart Devices

Power off your routers and the server (main) computer, then turn them back on.

### 2. Check Physical Connections

- Ensure the **grey or white network cables** are plugged in firmly at both ends.
- Confirm the **Server** machine has a solid cable connection to the main router.
- Look at the router lights to ensure they are on and blinking.

### 3. Ensure a Single Server

Verify that **only one** computer on the network is set as the `server` in `tl-sys-configure`. Having two servers will cause the network to fail.

### 4. Check Student Configuration

On a student computer that cannot connect, run `tl-sys-configure` and confirm:

1. **Role**: Set to `client`.
2. **Wi-Fi Name**: Set to the correct network name.

### 5. Check Server Status

On the **Server** computer, check if the "address server" (DHCP) is running. Open the terminal and type:

```bash
rsv status dhcpd4
```

> **Expected Result:** The status should show `run`. If it shows `down`, type `sudo rsv restart dhcpd4`.

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### Common Problems & Solutions

| Problem                  | Quick Fix                                                                             |
| :----------------------- | :------------------------------------------------------------------------------------ |
| **No Wi-Fi visible**     | Check if the Server and Router are powered on and the Server's own Wi-Fi is disabled. |
| **"Limited Connection"** | This usually means the address server is not working. See Step 5 above.               |
| **Very Slow Network**    | Too many computers on Wi-Fi. Connect more machines using grey/white cables.           |

> [!TIP] **Focus Mode**
> This page has the side menu hidden to help you focus on the fixing steps while working in a busy classroom.

