Hi there! I see you've run into a "Bad Request" error when trying to connect to The Sun Digital Newspaper and specifically the Sun Puzzles using Google Chrome and Firefox on your Windows 10 device. That message about not being able to connect to the server can pop up for a few reasons.

To help you better, could you tell me:
- Are you seeing this error only with The Sun apps or also when accessing the website directly through your browsers?
- Have you tried accessing the site or app using a different network (e.g., switching between Wi-Fi and a mobile hotspot)?
- Have you made any recent changes to your browser settings, like clearing cookies or installing new extensions?

Meanwhile, here are some straightforward steps to try that often resolve these kinds of connection issues:

1. Clear your browser cache and cookies: Sometimes outdated or corrupted cookies/cache can cause server requests to fail. Here's how:
- For Chrome: Click the three dots > More tools > Clear browsing data. Choose "Cookies and other site data" and "Cached images and files," then clear data.
- For Firefox: Click the hamburger menu > Options > Privacy & Security > Cookies and Site Data > Clear Data.

2. Restart your device: This can clear temporary files and reset network connections.

3. Check your internet connection: Make sure you're connected to a stable network. Switching between Wi-Fi and mobile data can sometimes resolve network-specific issues.

4. Try accessing The Sun website directly using your browser: https://www.thesun.co.uk/ — see if the puzzle section or digital edition loads without errors.

5. Disable browser extensions temporarily: Sometimes ad blockers or privacy extensions interfere with website requests.

6. Check for app updates or reinstall the Sun app: If you use a dedicated app for puzzles or the digital newspaper, ensure it’s updated or try reinstalling to clear its cache.

If after these steps you still get the "Bad Request" error, it could be a configuration issue on the server side or overload from traffic. In that case, I can further assist or escalate for back-end checks.

Let me know what you observe after trying these and any details you can add! That way, I can tailor the next steps for you.