You cannot configure the maximum number of concurrent SMB requests that are sent to a Windows Vista-based file server.

When a Windows Vista-based computer is used as a file server, users access files by using long-term Server Message Block (SMB) requests. By default, only 10 SMB requests can be sent to the server at the same time. All other SMB requests are not answered. Therefore, the user of a client computer may receive an error message when the user tries to access files by using long-term SMB requests.

Note: Unlike typical SMB requests, a long-term SMB request remains open until it is answered by the server. A typical long-term SMB request is the NotifyChange SMB request (NT_TRANSACT_NOTIFY_CHANGE).