We have windows 2000 server domain and a file server which is running on windows 2003Server. client PCs are Windows XP Pro. The problem is users suddenly got disconnected from the file server and getting an error message " the network drive is already in use". After i restart the file server all the users are able access the server again. Can anybody give suggestions what could be the reason behind this? This problem is occuring once in 15 days.We have mcafee 8.0 and Mcafee epolicy orchestrator for protection.