Cannot connect to Zoho CRM via Chrome / IE / Firefox

Cannot connect to Zoho CRM via Chrome / IE / Firefox

Good Morning all =)

Since yesterday one of our users is getting this message when she tries to access her Zoho CRM account from any of this sources:
Via the bookmark on her Google Chrome browser
Via the link inside Google Apps
Via IE by searching the main login page on Google
Via Firefox by searching the main login page on Google

For reference this is the message we're seeing:






Thanks for your help,