Password protect Internet Explorer? Password Protect Firefox? Password Protect Netscape? Password Protect Outlook? Password protect any internet connection. You can use Internet Lock to password protect the internet access. You also can use Internet Lock to deny access to any TCP port, or prevent any program from accessing internet. Internet Lock is an access control and password protection software for your Internet and intranet connections, it can deny or password protect any program to access the Internet/intranet on any TCP/IP port. Internet Lock works with the "RULES" mode: you can add one or more rules to the software to control its works.