Hi,
1. Could you please share the error message when you failed to open remoteapp?
2. Have you tried to remote to RDS Farm directly (use remote desktop) instead of remote app when Broker is down?
3. Please test to disable new connection on Connection Broker server and test if remote app worked well when CB is down.
If you have test environment, you could try the powershell script in below link:
Set-RDSessionHost
-SessionHost
"rdsh01.domain.com"
-NewConnectionAllowed No
-ConnectionBroker
"broker.domain.com"
https://social.technet.microsoft.com/Forums/windows/en-US/32ac82fc-e94c-4658-9f51-def0a61d8ba5/powershell-script-to-change-allow-new-connections-from-true-to-false?forum=winserverTS
Thanks,
Jenny
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