Server 2003 shares require "SMB signing" to be enabled.

Samba does not play nice with SMB signing from my past experiences...

There are articles on the net with information on how to get around SMB signing but that requires quite a few changes to your Win2k3 box IIRC.

You may try using this command:

cifsmount

Instead of smbmount. This uses the CIFSfs instead of SMBFS...

Not sure if this filesystem support is in the Knoppix version that you are using...

Sorry I can't give syntax examples but currently I am not on a linux machine.