Recently I blogged about the XenServer 6.1 issues that Citrix announced here for customers facing blue screens and other issues such as

• Add PVS support in XS 6.1
• Resolve intermittent grey screen on Windows Server 2003
• Resolve intermittent blue screen on VM migration
• Resolve intermittent blue screen after attempting VM shutdown
• Reinstate support for VSS shadow copy services

Citrix has announced two hotfixes that should resolve these issues that should be applied in order to resolve the above issues.

Hotfix XS61E009 – For XenServer 6.1.0 

This is a hotfix for customers running XenServer 6.1.0. This is the first part of a two component fix, customers should install CTX136253 – Hotfix XS61E010 – For XenServer 6.1.0 after installing this hotfix.

Issues Resolved In This Hotfix

1. Virtual Machines (VMs) with out of date XenServer Tools, may not be flagged as “out of date” in XenCenter. This hotfix resolves this issue and enables customers to be notified in XenCenter when new XenServer Tools are available.
2. Booting a Citrix Provisioning Services (PVS) target device using a Boot Device Manager (BDM) image can take an extended time to complete. This hotfix resolves this issue.

Hotfix XS61E010 – For XenServer 6.1.0 

This is a hotfix for customers running XenServer 6.1.0. This is the second part of a two component fix, customers must install CTX136252 – Hotfix XS61E009 – For XenServer 6.1.0 before attempting to apply this hotfix.
Important:

• Before installing this hotfix, customers who have previously referred to CTX135099 – XenServer Tools Workarounds for XenServer 6.1.0 for workaround instructions should review it again as it contains updated content.
• After applying this hotfix, customers should upgrade the XenServer Tools in each Windows Virtual Machine (VM). See the section, Upgrading XenServer Tools in VMs later in this article.
• Customers should upgrade the XenServer Tools before configuring the network settings on VMs.

Issues Resolved In This Hotfix

This hotfix resolves the following issues:

1. Customers using XenServer Platinum Edition to license Citrix Provisioning Services (PVS) may find that one PVS license per VM is checked out, rather than one PVS license per XenServer host. This may lead to a shortage of PVS licenses and an inability to provision VMs. Installing this hotfix along with CTX135672 – Hotfix CPVS61016 (Version 6.1.16) – For Citrix Provisioning Services 6.1 – English resolves this issue.
2. Attempts to shut down Microsoft Windows Vista and later VMs can cause intermittent blue screen errors, with a "STOP: 0x0000009f..." error message.
3. Adding more than eight NICs to Microsoft Windows Vista and later VMs, using the xe CLI can lead to a blue screen error on reboot.
4. Copying data to a Microsoft Windows 2003 VM can cause the VMs to hang and lead to a grey screen error.
5. When Dynamic Memory Control (DMC) is enabled, attempts to migrate Microsoft Windows XP and later VMs using XenMotion can cause the VMs to hang and lead to blue screen error.
6. When the Citrix Xen Guest Agent service is running, Cut and Paste will not work between a XenDesktop virtual desktop and the endpoint device.
7. Microsoft Windows XP and later VMs may hang during the boot process and may have to be forced to reboot.
8. Attempting to install or upgrade the XenServer Tools on Microsoft Windows Vista and later VMs, which do not have access to a paravirtualized or an emulated network device can cause the installation process to hang.
9. Manually installing the Legacy XenServer Tools without changing the device_id to 0001 can result in a "STOP: 0x0000007B..." error when rebooting a Windows VM. After installing this hotfix, customers will not be able to manually install the Legacy XenServer Tools by running xenlegacy.exe. When customers start the XenServer Tools installation process, the installwizard.msi will be launched automatically.
10. Microsoft Volume Shadow Copy Services (VSS) (required for third party backup solutions) was unavailable on Microsoft Windows Server 2008 in the original version of XenServer 6.1.0. After installing this hotfix, XenServer 6.1.0 customers will be able to take quiesced snapshots on Microsoft Windows Server 2003 and Windows Server 2008 VMs. Note VSS is not supported for Windows Server 2008 R2.

In addition, this hotfix also contains several usability and performance improvements