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Check Laptop Network Settings:
Poor Internet Connection: A weak or unstable internet connection can cause difficulties loading certain websites.
Incorrect DNS Settings: Incorrect DNS settings on the laptop could route requests to the wrong server.
Security Software Interference:
Firewall Blocking: The laptop's firewall might be configured to block access to the specific website, considering it a security threat.
Antivirus Interference: Some antivirus programs may mistakenly flag a website as malicious, preventing access.
Browser Issues:
Outdated Cache: Cached data in the browser might be corrupted, causing issues loading the website.
Cookie Issues: Corrupted cookies associated with the website could interfere with loading.
Browser Extensions: Certain browser extensions might conflict with the website's functionality.
Compatibility Issues:
Outdated Browser Version: An outdated browser version might not be able to properly render the website's code.
Browser Specific Issues: Some websites might have compatibility issues with certain browsers.
What to do:
Check your internet connection:
Ensure you have a stable internet connection and try accessing other websites.

Clear browser cache and cookies:
Clear the cache and cookies for the specific website in your browser settings.

Try a different browser:
Open the website using a different web browser to check if the issue is browser-specific.
Review firewall and antivirus settings:
Check your firewall and antivirus settings to ensure they are not blocking the website.

Update your browser:
Make sure you are using the latest version of your web browser.

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https://www.namehero.com/blog/5-ways-to-fix-the-this-site-cant-be-reache...
From the Windows Defender Firewall window, click on “Allow an app or feature through Windows Defender Firewall.” Ensure that the desired web browsers (e.g., Google Chrome) is listed and has both the “Private” and “Public” checkboxes ticked. If it is not listed, click on “Change settings” and then “Allow another app” to add the browser.
Click “OK” to save the changes and exit the Windows Defender Firewall settings.
For Antivirus software
Locate your antivirus software icon in the system tray or search for the program in the Start menu. Double-click on the icon to open the antivirus program.
Look for settings related to firewall or network protection within the antivirus program. This may be located in the main dashboard or within the settings/preferences menu.
Ensure that your web browser (e.g., Google Chrome) is listed and allowed access to the internet. If it is not listed, look for options to add an application or create an exception.
Save the changes made to the antivirus program’s firewall or security settings.
#4. Flush Your DNS Cache
One of the reasons why “This site can’t be reached” error error typically occurs is due to DNS (Domain Name System) issues, which can be resolved by flushing the DNS cache. Let’s discuss how you can troubleshoot and resolve the “This site can’t be reached” error by flushing DNS cache.
Press the Windows key + R, type “cmd” in the Run dialog box, and press Enter. This will open the Command Prompt.
In the Command Prompt window, type the following command and press Enter:ipconfig /flushdnsThis command instructs your system to clear the DNS cache.
Once the command executes successfully, you will see a message confirming that the DNS cache has been flushed.
If flushing DNS didn’t resolve the error, let’s try to change the DNS servers.
#5. Change DNS Servers
Sometimes, the default DNS servers provided by your internet service provider (ISP) may be experiencing issues. Changing to alternative DNS servers, such as Google DNS or OpenDNS, can help resolve the “This site can’t be reached” error. Here’s how to change your DNS servers:
Press the Windows key + R, type “ncpa.cpl” in the Run dialog box, and press Enter. This will open the Network Connections window.
Right-click on your active network connection and select “Properties.” This will open the network adapter properties window.
In the network adapter properties window, locate the “Internet Protocol Version 4 (TCP/IPv4)” option and double-click on it.
In the Internet Protocol Version 4 (TCP/IPv4) properties window, select the option “Use the following DNS server addresses.”
Enter the preferred and alternate DNS addresses. For example, you can use Google DNS by entering “8.8.8.8” as the preferred DNS server and “8.8.4.4” as the alternate DNS server.
Click “OK” to save the changes and exit the properties window.
By flushing your DNS cache and changing DNS servers, you can effectively troubleshoot DNS-related issues that may be causing the “This site can’t be reached” error. These methods help ensure that your system is obtaining accurate and up-to-date DNS information, enabling successful website access.
For understanding more, refer to images from here:
https://docs.google.com/document/d/12sQMJwfMJwgO-kaESxaM3L2Hj7PMm3COFc-I...