External VDI (No VPN) - Opens Print Page

Hi,

Any suggestions on what could cause this behavior?

We're allowing external traffic to a VDI environment. The necessary ports are listening. Using Chrome for HTML connections, we can get to the site and authenticate, but after clicking a desktop pool to open we get a Print page like below. If cancelled, it remains a blank window.

Other browsers open to a blank window. Only Chrome opens the Print page, but none of the browsers open a desktop without VPN. But all can authenticate.

IE, Safari, FireFox and Chrome were tested.

When onsite or on VPN, the connections work as expected.

Thanks for any help or suggestions.