Download and run the certificate:

Go to our website here  

On the bottom right, click on the WiFi link

Select download certificate, then open from your downloads.

Click 'Certificates'

Select NC-2 Smoothwall (double click)

Now expand the 'Trust' area

Drop down the 'Use System Defaults' option.

Change the option to  'Always Trust'

Now close the window and enter your username and password for logging onto the mac

Close safari/chrome then re-Open and start browsing the internet.  Finished.