No. By default, some ports are already configured by the operating system or additional security applications to allow and pass safe traffic through to your computer (example: Web pages, email, newsgroup, uploading your personal web site and games). Similar with proxy servers being disabled. However, if you enabled access to allow other traffic in/out of your computer, you will need to configure and secure the system. If you received a virus enabling an open port or creating a proxy configuration, you will need to disable access to block unwanted spammers, hackers, etc. from silently entering and exiting your computer.