Make public Wi-Fi more secure on Windows and Android

Imagine you are sitting in a café with your laptop open, and a sign reads “Free Wi-Fi – No Password.” You connect and open your banking app. That is exactly where the danger begins – and most people aren’t even aware of it. Securing your connection on public Wi-Fi is just as important these days as locking your front door. In India, free public Wi-Fi is available everywhere – at railway stations, airports, coffee shops, malls, and university campuses. And everywhere, hackers are looking for people who connect without a second thought.

This guide is for anyone who uses public networks on a Windows PC or Android phone and wants to keep their privacy and data safe. No technical jargon – everything is explained in simple language, step-by-step.

What is the real danger of public Wi-Fi?

First, it is important to understand why public networks are dangerous. When you connect to an open Wi-Fi network, anyone on the same network can intercept your data.

The most common attacks that occur on public Wi-Fi are:

• Man-in-the-Middle (MITM) Attack – A hacker positions themselves between you and the website to read all the data – passwords, OTPs, banking details, and everything else.
• Evil Twin Attack – A hacker creates a fake Wi-Fi hotspot with a name that closely resembles a legitimate one (e.g., “CCD_Free_Wi-Fi” instead of “CCD Free Wi-Fi”), and you connect to it.
• Packet Sniffing – Data being transmitted over the network is intercepted and read.
• Session Hijacking – Your active website sessions are hijacked.
• Malware Distribution – Certain networks attempt to install malware on your device.

Railway Wi-Fi, Airport Wi-Fi, and Jio-BSNL hotspots are very popular in India, yet very few people connecting to them know how to secure public Wi-Fi.

Ways to secure public Wi-Fi on a Windows PC

Step 1: Set the Network Type to “Public”.

This is the first and most important step. When you connect to a new Wi-Fi network for the first time, Windows asks, “Is this a public or private network?”

Always select “Public Network”.

This causes Windows to automatically:

• It turns off file and printer sharing.
• Network discovery is disabled – meaning other devices cannot see your PC.
• Windows Firewall switches to strict mode.

Change this if ‘Private’ was selected previously:

1. Open Settings (Win + I).
2. Go to Network & Internet > Wi-Fi.
3. Click on the name of the connected network.
4. Select ‘Public’ under Network profile type.

Step 2: Keep Windows Firewall turned on

Windows Firewall is your first layer of protection. Never turn it off – especially on public networks.

Check this:

1. Settings > Windows Security > Firewall & network protection.
2. Check if the Firewall is turned on for the Public network.
3. If it is off, turn it on immediately.

Step 3: Turn off Network Discovery and File Sharing

Go to Control Panel > Network and Sharing Center > Advanced sharing settings.

In the Public section:

• Turn off network discovery – ✅
• Turn off file and printer sharing – ✅

Save the changes. Now, no other user can see your PC on the network.

Step 4: Use only HTTPS websites.

Whenever you are on public Wi-Fi, make sure to check for “https://” in the browser’s URL bar. HTTPS provides an encrypted connection that prevents data from being intercepted.

Install the HTTPS Everywhere extension:

• Available on Chrome, Firefox, and Edge.
• Created by the EFF (Electronic Frontier Foundation).
• Download: eff.org/https-everywhere – completely free.
• It automatically redirects HTTP to HTTPS.

Step 5: Turn off Auto-Connect Wi-Fi

Windows automatically connects to any known or open network. This can be very dangerous.

Steps to turn off auto-connect:

1. Click the Wi-Fi icon in the taskbar.
2. Click the > arrow next to the connected network.
3. Uncheck the “Connect automatically” checkbox.

Alternatively, go to Settings > Network & Internet > Wi-Fi > Manage known networks and ‘Forget’ old public networks.

Step 6: Keep Windows Update enabled.

It may seem tedious, but it is essential. It is easy to be attacked via unpatched vulnerabilities on public networks.

• Settings > Windows Update > Check for updates.
• If there are pending updates, install them before using public Wi-Fi.
• Always keep Windows Defender updated – this free antivirus provides real-time protection.

Step 7: Turn off Shared Folders and Remote Access

If you ever enabled folder sharing on your home network, disconnect it on a public network.

Quick check:

• Control Panel > Programs > Turn Windows features on or off.
• Disable “SMB 1.0/CIFS File Sharing Support”.
• This old protocol is a favorite among hackers.

Ways to secure public Wi-Fi on an Android phone

Step 1: Verify First – Connect to the Genuine Network

“Evil Twin” attacks are very common in India. Before connecting to McDonald’s Wi-Fi, ask the staff for the exact network name.

Red flags that indicate a fake network:

• It does not ask for a password (whereas a real network requires one).
• There is an extra space or a spelling mistake in the network name.
• The signal is very strong, but no device is visible nearby.

Step 2: Check Network Type and Privacy Settings on Android

Android 10+ includes a hidden feature: Randomized MAC Address. It displays a fake MAC address for your device on every Wi-Fi network, making tracking difficult.

To enable it:

1. Tap on Settings > Wi-Fi > Connected network name.
2. Look for the Advanced or Privacy section.
3. Keep the ‘Use randomized MAC’ option enabled – it is on by default in Android 10+.

Step 3: Turn off Auto-Join / Auto-Connect

Go to Settings > Wi-Fi and tap on the network name. Turn off the Auto-connect or Auto-join toggle.

Alternatively, go to the list of known networks and ‘Forget’ old public networks.

Step 4: Do not open sensitive apps on public Wi-Fi at all.

This is the most practical advice. Never do these things on public Wi-Fi:

• Net Banking app login.
• UPI transactions (PhonePe, GPay, Paytm).
• Social media password change.
• Sensitive attachments in email.
• Government portals (DigiLocker, Income Tax).

Use mobile data for these tasks – it is more secure.

Step 5: HTTPS Check Browser Extension

Look for the padlock (🔒) icon in the address bar on Android Chrome. If it says “Not Secure,” do not enter any personal information on that site.

Firefox Focus (free) is a privacy-focused browser that automatically prefers HTTPS.

• Download: Google Play – Firefox Focus

The most important security – use a VPN.

A discussion on securing public Wi-Fi is incomplete without mentioning VPNs. A VPN (Virtual Private Network) encrypts your entire internet traffic.

When you turn on a VPN:

• Your data passes through an encrypted tunnel.
• Hackers see only encrypted gibberish in the intercepted data.
• Your real location and IP address are hidden.
• Even your ISP and network admin cannot see what you are doing.

Best Free and Paid VPN Options:

Proton VPN (Free + Paid)

• No-logs policy.
• Based in Switzerland – strong privacy laws.
• Unlimited data on the free plan – this is rare.
• Available on both Windows and Android.
• Website: protonvpn.com – Free; plus $4.99/month.

Windscribe VPN (Free + Paid)

• 10GB/month in the free plan.
• Ad and tracker blocking built-in.
• Windows, Android, Browser extension.
• Website: windscribe.com – Free; Pro $9/month.

Mullvad VPN (Paid but best for privacy)

• Account number-based – no email required.
• Flat pricing of €5/month.
• Website: mullvad.net

NordVPN (Paid – most popular)

• Double VPN, Threat Protection.
• The most widely used in India.
• Website: nordvpn.com – $3.39/month (2-year plan).

Note: Some free VPNs sell your data themselves. Use only trusted VPNs – Proton VPN and Windscribe are the safest free options.

For Advanced Users – Enable DNS-over-HTTPS

DNS tells your browser the IP address of a website. On public Wi-Fi, DNS requests are unencrypted – meaning the network administrator can see which websites you are visiting.

DNS-over-HTTPS in Windows 11:

1. Settings > Network & Internet > Wi-Fi > Hardware properties.
2. DNS server assignment > Edit.
3. Select Manual.
4. Preferred DNS in IPv4: 1.1.1.1 (Cloudflare), Alternate: 8.8.8.8 (Google).
5. DNS over HTTPS: On (Automatic template).

On Android:

1. Settings > Network & Internet > Advanced > Private DNS.
2. Hostname: Type dns.cloudflare.com or dns.google.
3. Save.

This is a small but effective step.

Checklist – Before and After Connecting to Public Wi-Fi

Before connecting:

• ✅ Turn on VPN
• ✅ Verify network name
• ✅ Close sensitive apps

After connecting – Windows:

• ✅ Set network type to “Public”
• ✅ Check that the firewall is on
• ✅ Network Discovery is off
• ✅ Browse only HTTPS sites

After connecting – Android:

• ✅ Do not use banking or UPI apps
• ✅ Auto-join is turned off
• ✅ Randomized MAC address is enabled
• ✅ Use Firefox Focus or a secure browser

After disconnecting:

• ✅ Forget the network (if it was public)
• ✅ Turn off the VPN (to save battery)
• ✅ Clear the browser cache

India-specific Tips – For Railway, Airport, and Café Wi-Fi

Certain public Wi-Fi situations in India require special attention:

Indian Railways Wi-Fi (RailTel):

• It uses OTP-based login – which is safe – but the connection is unencrypted.
• Perform sensitive tasks only while using a VPN.
• Speeds are slower, so avoid video streaming.

Airport Wi-Fi:

• Fake hotspots are most commonly found at airports.
• Check the official Wi-Fi name of the airport authority first.
• Always use a VPN.

Café and Restaurant Wi-Fi:

• It is password-protected – somewhat safe.
• However, there could be hundreds of users on the same network.
• Absolutely no banking.

College/University Wi-Fi:

• It is often monitored.
• Avoid piracy or illegal activity.
• A VPN is helpful here as well.

Be sure to check out fixtech.in for detailed guides on PC and Android security – there, you will find practical cybersecurity and privacy tips to protect your daily digital life.

A real-life example – the consequences of not paying attention:

A freelancer at a Delhi café connected to the free Wi-Fi in Connaught Place and logged into net banking to receive a client payment. A Man-in-the-Middle (MITM) attack was underway on that same network. Their session cookies were stolen, and three days later, an unauthorized transaction was made from their account.

This isn’t a movie plot; thousands of such cases are registered on the India Cyber ​​Crime Portal. Making public Wi-Fi secure isn’t a technical luxury – it is a necessity.

FAQs – About Securing Public Wi-Fi

Final Thoughts

Public Wi-Fi has become an integral part of modern life – it is unavoidable, but you can stay safe while using it. Use a VPN, check for HTTPS, set your network to ‘Public,’ disable auto-connect, and never use public Wi-Fi for banking. Whether you use Windows or Android, these steps apply to both, and most of them are completely free. A little awareness and a few minutes spent adjusting settings can significantly secure your digital life. Making public Wi-Fi usage safe isn’t rocket science – it’s simply about adopting the right habits, and this guide helps you do exactly that.