Error: Unable to launch as the application is not currently available
Event 1101. This event refers to “The Citrix Broker Service cannot find available virtual machines.”
CDF traces, you can search for the entry, as displayed in the following screen shot –
“Launch failed: NoDesktopAvailable”.
from PowerShell the command Get-BrokerMachine and you must ensure that WindowsConnectionSetting is configured asLogonEnabled.
If WindowsConnectionSetting is configured as LogonDisabled, you can enable logon by modifying the following registry key:
fDenyTSConnections: 0 -> Logon Enable
fDenyTSConnections: 1 -> Logon Disabled
Setting RegKey fDenyTSConnection to 0 resolved the problem.
If not working try:
PS H:> Add-PSSnapin citrix*
PS H:> Set-BrokerSite -TrustRequestsSentToTheXmlServicePort $True
Ref: Citrix support