Every now and again our Citrix Server Farm looses connectivity with the Domain Controller and becomes dead in the water. When it looses its connectivity, the entire farm cannont communicate. Also, the server is unresponsive to reboots either locally or remotely. The machine needs to be hard booted in order for it to return to a normal state. I have gone through the event logs and the only event ID that relates to this is 5783. Any suggestions or ideas?