Use a different browser than chrome if that's what you used in the past. We are having this same issue too and the warning is blank except for a time stamp. Also, HTML Blast does not work through chrome anymore, it says it can't find the connection server, but all other browsers work.
Google Chrome no longer works with Horizon View 7 products.
While hard to believe we've testing on several OS's, and machines on prem and off. We've tested version
The specific pages/items that don't work any longer are:
Load Balanced https://view.site.com/admin
Hostname only https://hostname/admin
HTML Access via hostname only https://hostname
HTML Access via Load Balanced name Https://view.site.com
Things that still work:
PCoIP via Client
FQDN Admin Page directly to connection server (not load balance name) https://FQDN
Right now it appears only directly to A connection server AND via FQDN (Yes I know this is best practice, BUT this wasn't broken before) is the only means working IN CHROME. IE and Edge are functioning correctly.
And confirmed it works in FireFox. It's a Chrome specific issue at the moment. I'm thinking our Load balancing isn't using FQDN in the back end and I bet something being handled in Chrome doesn't like what view is presenting anymore unless it's a FQDN