You successfully connect your computer to a wireless network available at the local library. Although you can access some websites, you can't access several other websites that you need for your research. Which of the following is the MOST likely cause of this problem? answer A firewall is blocking ports $80$ and $443.$ A proxy server is filtering access to websites. Port triggering is redirecting traffic to the wrong IP address. The router has not been configured to perform port forwarding.