For Windows users, you can do this by going to your control panel and navigating to Update & Security > Windows Security > Virus & Threat Protection > Manage Settings.
Mac users can find this option by navigating to System Preferences > Security & Privacy > Firewall
Once your firewall is deactivated, try visiting the website again from your browser. If this resolved the issue, you might consider switching antivirus programs or reconfiguring the settings of your existing application. Either way, remember to reactivate your firewall once you’re done.