Unattended Support not Connecting

Hi,
I'm having an issue this morning where I am unable to access any of my 50+ PC's on Zoho Assist Unattended. They are showing as Online but when I click on them they start to connect and get stuck on "Starting Support Session". Speaking to my clients, it seems they get a pop up asking them to enter Proxy details. They aren't behind a proxy.

Please help, I need to help customers!

Thanks,

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Sticky Posts
Release Notes: Version 1.91, February 2015
Unattended Access (Beta) is live! Unattended Access, a feature requested by a lot of our customers is live now. Currently, it's in beta. You can add up to 100 computers per Technician subscription. They can also be accessed by your organization members. My Computers list in Zoho Assist home page will always display the online status of your unattended computers. You can rename the computers whenever you wish. Currently, Unattended Access can be configured only for Windows computers. Nevertheless,