Windows has a built-in firewall that controls how programs connect to the Internet. If your Windows Firewall doesn’t allow Firefox to make connections, Firefox will display a “Server not found” error when you try to browse the web. How to allow a website through Windows firewall?
Enable Microsoft Defender Firewall
- Select the Start button, then Settings> Updates and security> Windows Security> Firewall and network protection. Open the Windows Security console settings
- Select a network profile.
- In the Microsoft Defender Firewall area, switch the setting to On. If your device is connected to a network, network policy settings may prevent you from completing these steps. Contact your administrator for more information.
Note: If there are errors or if the setting cannot be turned on, you can use the troubleshooter and try again.
Disable the Microsoft Defender Firewall
- Select the Start button, then Settings> Updates and security> Windows Security> Firewall and network protection. Open the Windows Security console settings
- Select a network profile.
- In the Microsoft Defender Firewall area, switch the setting to Disabled. Disabling Windows Defender Firewall may make your device more susceptible to the risks of unauthorized access (including networks, if any). If an important application is blocked, you can enable its access through the firewall instead of disabling the entire firewall.
Allow application to access through the firewall
- Select the Start button, then Settings> Updates and security> Windows Security> Firewall and network protection. Open the Windows Security console settings
- Select Allow application to be accessed through the firewall.
- Select the application you want to allow access.
- Select OK.
If you trust a file, file type, folder or process that Windows Security has recognized as malicious, you can add it to the exclusion list to prevent alerting or blocking.
- Select Start> Settings> Update and security> Windows Security> Virus and threat protection.
- Under Virus and threat protection settings, select Manage settings and then under Exclusions select Add or remove exclusions.
- Select Add exclusion and then select files, folders, file types or process. Exclusions will also apply to subfolders in the folder.
