Some routers require passwords in a particular format. Users may find that after entering a password for a WEP Internet connection, their AirPort menu bar icon shows an exclamation mark. You may also see an alert that reads, "Alert: No Internet connection..."
These routers actually have open networks that your Mac will associate with, but they still require a correctly formatted password to connect to the Internet. If the password is not interpreted correctly, the exclamation mark will appear and you will be unable to access content online.
To remedy the situation, you need to adjust the format … Read more