http://bugs.winehq.org/show_bug.cgi?id=19517
--- Comment #24 from David Wahlstrom drwahls@gmail.com 2010-03-30 10:51:44 --- I was contacted by a Citrix employee who saw this bug report and gave me a work around. When adding a server, you can include :80 which will work around most of the security stuff XenCenter does. So, after clicking "Add Server" in XenCenter, in the "Server:" box, put "foo.example.com:80". With this work around, XenCenter works well in Wine.