When you use net view or browse the network using My Network Places, you receive:
System Error 1230 has occurred.
An invalid operation was attempted on an active network connection.
If you have a single Windows 2000 server, that is a print server, file server, and browse master for the network, this error will occur if a direct host, port 445, connection from a client has a pending SMB transaction when a Computer Browser service attempts to connect using NetBIOS over TCP/IP, port 139.
To prevent this error, force all connections to use NetBIOS over TCP/IP.
Run the following SMBDeviceEnabled.reg file on the server and all Windows 2000 and Windows XP clients:
NOTE: You could use Workstation.bat.