Errors occurred when using <servername> in the discovery process

Written by Ingmar Verheij on January 9th, 2012. Posted in XenApp (Presentation Server)

Author : Ingmar Verheij

When opening the Citrix Access Management Console (AMC) you might get the error “Errors occurred when using <servername> in the discovery process”. This is a typical error in a Citrix XenApp (5, 6 or Presentation Server 4.x) environment.

There are multiple causes of this problem, some are more obvious then others.

Please wait for the Local Session Manager

Written by Ingmar Verheij on October 20th, 2011. Posted in XenApp (Presentation Server)

Author : Ingmar Verheij

I’ve built a lab to run some tests on Citrix XenApp. Since this is a lab environment I do not have enough resources to create dedicated machines for each role. Therefore I found it justified to create a virtualized domain controller (dc001.domain.local) with multiple roles and multi-homed (Boooohhh, I know). The machine is not only a domain controller but also has the DNS and DHCP role.

The following network interfaces are present on dc001.domain.local:

  • Local Area Connection 1 :
  • Local Area Connection 2:

The Citrix XenApp server is a dedicated physical machine with a single network interface:

  • Local Area Connection 1 :

After creating a published desktop I’ve tried to connect from a machine in the subnet. The session keeps waiting with the message ‘Please wait for the Local Session Manager’.

No network on WANem (Citrix XenServer)

Written by Ingmar Verheij on October 20th, 2011. Posted in XenServer

Author : Ingmar Verheij


WANem is (as the name implies) a WAN emulator that’s available for free and therefor ideal to use in a lab environment. WANem is built on the Knoppix distribution and supplied as a bootable ISO or a virtual appliance. Unfortunately the virtual appliance is only provided for the VMware hypervisor.

I’ve got a lab built on the Citrix XenServer hypervisor and should therefore use the ISO. Installing (or actually booting) WANem is no rocket science, using it is a bit more complex. A guy named José Luis Gómez Ferrer de Couto has written an easy to understand  tutorial  (in Spanish) how to use WANem in Citrix XenServer.

Unfortunately there is a small pitfall on my Citrix XenServer 5.6 machine, the network is unreachable.

HP Proliant DL380G6 unexpected reboot

Written by Ingmar Verheij on July 1st, 2011. Posted in XenServer

HP LogoCitrix XenServer 5.5.0 is installed on a HP Proliant DL380 G6 server. The customer complained that VM’s experienced unexpected shutdowns without finding the cause of the problem.

After spending some time troubleshooting on the virtual machines I couldn’t find the source of the problem. No BSOD on the VM’s, UPS showed no loss of power and there are no scheduled mechanismes that can cause the issue on the specified dates.

Eventually  I found that the cause of the issue is a bad driver as part of the HP Insight Manager Agent.

The impact of Silverlight on a virtual desktop

Written by Ingmar Verheij on June 24th, 2011. Posted in Desktop Virtualization, Performance testing, XenApp (Presentation Server)

Silverlight Logo

A customer has a (virtualized) Citrix XenApp farm scaled for 1500 concurrent users. The environment is based on Windows Server 2003 Standard with Citrix XenApp 5 (migration to XenApp 6.x is scheduled).

A business critital web-application is re-developped and requires Microsoft Silverlight. Before implementing Silverlight the impact should be determined. A big concern is a decrease in the capacity of the farm, number of concurrent users the farm can handle.

To determine the impact of Silverlight I’ve done some tests, including a LoadTest.