VMM is unable to complete the request. The connection to the agent <Xen server> was lost.
Unknown error (0x8033810f)
Ensure that the WS-Management service and the agent are installed and running and that a firewall is not blocking HTTPS traffic.
This problem can also be caused by WMI service crash. Ensure that KB 982293 (http://support.microsoft.com/kb/982293) is installed on the machine if it is running Windows Server 2008 R2.
If the error persists, reboot <Citrix host> and then try the operation again.
1. Set the SendExtraRecord registry value to 2 by performing the steps documented in the following Microsoft knowledge base article:
2643584 - MS12-006: Vulnerability in SSL/TLS could allow information disclosure: January 10, 2012 (http://support.microsoft.com/kb/2643584)
2. Once the SendExtraRecord registry value is set to 2, add the Citrix XenServer host.
How to add XenServer hosts to VMM: http://technet.microsoft.com/en-us/library/gg610684.aspx
Article ID: 2728902 - Last Review: 2 Jan 2013 - Revision: 1