Problem
You have received reports from a select few users that they receive the following error message when they attempt to launch an application from the StoreFront portal:
Cannot start App “Outlook 2013”
Logging onto the Citrix Delivery Controller and reviewing the application logs show the following warnings:
Log Name: Application
Source: Citrix Broker Service
Event ID: 1102
Level: Warning
User: NETWORK SERVICE
Computer: Citrix Delivery Controller
The Citrix Broker Service failed to broker a connection for user 'DOMAIN\G0052014' to resource 'Outlook 2013'. The virtual machine 'S30015-205-CX03.ad.domain.com' rejected a request to prepare itself for a connection. This problem usually indicates that the virtual machine is engaged in an activity such as restarting, entering a suspended state, or processing a recent disconnection or logoff.
If this problem persists, please restart the virtual machine.
**Note that S30015-205-CX03 is the application server with the VDA agent
Log Name: Application
Source: Citrix Broker Service
Event ID: 1101
Level: Warning
User: NETWORK SERVICE
Computer: Citrix Delivery Controller
The Citrix Broker Service failed to broker a connection for user ‘Domain\G0052014' to resource 'Outlook 2013'. The Citrix Broker Service cannot find any available virtual machines.
Please add more virtual machines to the site. If the problem is due to existing virtual machines not becoming available, see Citrix Knowledge Base article CTX126992.
Attempting to launch another application such as notepad logs a similar warning event:
Log Name: Application
Source: Citrix Broker Service
Event ID: 1102
Level: Warning
User: NETWORK SERVICE
Computer: Citrix Delivery Controller
The Citrix Broker Service failed to broker a connection for user 'DOMAIN\G0052014' to resource 'Notepad'. The virtual machine 'S30015-205-CX03.ad.domain.com' rejected a request to prepare itself for a connection. This problem usually indicates that the virtual machine is engaged in an activity such as restarting, entering a suspended state, or processing a recent disconnection or logoff.
If this problem persists, please restart the virtual machine.
Logging onto the StoreFront server and reviewing the event logs show the entries:
Log Name: Citrix Delivery Services
Source: Citrix Store Service
Event ID: 28
Level: Warning
User: N/A
Computer: Citrix StoreFront
Failed to launch the resource 'DR.Notepad' using the Citrix XML Service at address 'https://s30015-205-cx01.ad.domain.com:443/scripts/wpnbr.dll'. The XML service returned error: 'connection-refused'.
**Note that S30015-205-cx01 is the delivery controller.
Log Name: Citrix Delivery Services
Source: Citrix Store Service
Event ID: 28
Level: Warning
User: N/A
Computer: Citrix StoreFront
A request from the Citrix server to prepare for a connection was rejected while processing the initialization of desktop group Notepad for user DOMAIN\G0052014. This message was reported from the XML Service at address https://s30015-205-cx01.ad.domain.com:443/scripts/wpnbr.dll [NFuseProtocol.TRequestAddress].
Not all of the users are affected as there are many others who are able to launch applications without any issues.
Solution
What ended up being the cause of this was that the Citrix Remote Broker Provider service was stopped on the Delivery Controller and restarting the service corrected the issue.
