On all of our Windows 2008 R2 Terminal Servers when trying to log into vCenter 4.1. U3 using the vClient, we are experiencing the following message pop up intermittently and when logged into vCenter. I was just wondering if anyone had experienced the same or similar issue. This has been going on for 3 months and we have a call outstanding with VMware but just reaching out to the wider community for any ideas. Note. This doesn't happen at all when using the vClient on vCenter directly. No firewalls and thought it might be a proxy issue but no proxy set anymore.