Here are some steps you can take to test and improve your internet connection on public networks:

1. Check for Internet Connectivity: Check to make sure your computer is properly connected to the network.
2. Check for Firewall Issues: Verify that there are no firewall settings disabling access to the Internet.
3. Check the Router Settings: Ensure that the router settings are not limiting internet access.
4. Check for Malware: Scan your device for any malicious software that may be preventing your computer or mobile device from connecting to the network.
5. Restart Your Device: Reboot the device to ensure that any errors or problems are cleared.
6. Disable VPNs:Disable any virtual private networks if they may be interfering with your internet connection.