RFC 4122 does allow the MAC address in a version-1 (or 2) UUID to be replaced by a random 48-bit node ID, either because the node does not have a MAC address, or because it is not desirable to expose it. In that case, the RFC requires that the least significant bit of the first octet of the node ID should be set to 1.
It does not look like Citrix have done any work to make Mac OS X an officially supported guest operating system for Xenserver. This does not mean it is completely impossible but it does mean as you have found that your on your own.
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Nov 08, 2016 Just run VMware Fusion or some Windows emulator on your Mac and you can use XenCenter that way (several of my co-workers do this). Or install it on a Windows server and remote into it. XenServer does not support Apple Mac OS X as a guest operating system. Additional Resources. For more information, refer the supported list on the vm on XenServer Citrix XenServer ® 6.5 Service Pack 1 Virtual Machine User's Guide. Was this page helpful? Sorry to hear that. Sep 05, 2018 Citrix Receiver for Mac 12 (PDF Download). Documentation for this product version is provided as a PDF because it is not the latest version. For the most recently updated content, see the Citrix Receiver for Mac current release documentation.
This contrasts with both VMware ESXi which does officially support Mac guests in ESXi running on a Mac, and Parallels Server. Both do this by doing two important things, firstly enforcing Apple's license conditions which only allow this if run on real Mac hardware and secondly by emulating the extra hardware that makes a Mac a Mac rather than a PC, they only get Apple's permission to do the later by agreeing to the former.
Hint - the issue that is preventing you running OS X in Xenserver is the same as that which prevents Virtualbox from running OS X.
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Ignoring technical issues the Apple licensing terms allow you to run up to two virtual Macs on a Mac and this is only for Mac OS X 10.6 Server, or OS X 10.7 Lion (client or server), or OS X 10.8 Mountain Lion (client or server), or OS X 10.9 Mavericks (client or server). You are not allowed to run Mac OS X 10.6 (client).