Can you check the Horizon Connection server debug logs and see if you can see any "origin" errors. Search the log for "origin". If you see errors, follow the origin checking documentation e.g. Documentation for VMware Horizon 7 version 7.0
So this is in C:\ProgramData\VMware\VDM\logs\debug<date><some other number>.txt ?
I can't find the word "origin" in there anywhere.
Also just noticed that the VMWare Horizon View Blast Secure Gateway service was set to manual and not started. Is that required? I started it anyway and it's not made any difference.
I've also just added portalHost=view-gateway.example.com to the locked.properties file but it hasn't helped either.
Sorted this in the end, I logged it with VMWare support:
"Use Blast Secure Gateway for HTML Access to machine" on the Connection Server properties in the Admin console was set to enabled.
I guess that's for Security Server scenarios only.
Thanks. Glad you were able to figure this out. It let me find and resolve the exact same problem on my deployment in just a matter of minutes.
I am facing the same problem and I unchecked "Use Blast secure gateway" on the connection server and still gives the same problem and in the url field it gives this error:
horizon 7.4 with UAG 3.2.1
Thanks!! This was the solution