I once did some research on this topic, and I think these links all describe the similar problem. http://serverfault.com/questions/182758/what-does-registry-setting-enablelinkedconnections-do-on-a-technical-level https://support.microsoft.com/en-us/kb/937624 https://support.microsoft.com/de-de/kb/2019185 http://technet.microsoft.com/de-de/library/ee844140(v=ws.10).aspx