The following sections can be used to track down any issues with the CIFS installation.
Some general tips.
There are Windows 2000 or later clients that will try and login via Native SMB and that does not work when running Alfresco CIFS server in parallel with Windows CIFS server. Only one server can listen to port 445 at a time and that is the Windows CIFS Server in this case.
Close down Windows CIFS Server to get around the problem. Usually, you have to stop Printer and File Sharing.
Also, make sure there is no firewall blocking the connection, try and telnet to the server and port.
This can happen if ...