Recently enabled AD authentication on our proxy appliance which allows internet access for our domain users.
Domain Structure
Parent Domain - Users working.
Child Domain 1 - Users working.
Child Domain 2 - Users seeing intermittent issues.
Error messages as below:
"Error: A network error occured".
"Could not establish a tunnel connection".
Only pattern/workaround I can see is initially when the user attempts to connect to Horizon, they receive the above error messages.
If they then launch IE browser on the local PC and access a webpage, retry connection to Horizon now works successfully.
Appreciate if anyone could provide some suggestions as to what might be the cause, or if they have experienced similar.
Thanks,