I have a PC running WinXPpro on the same network as a PC running Debian 3.0 (Knoppix HD install), connected through a switch.

I can ping each box from the other, and in Konqueror I can "smb://server/share" the XP box and see the contents of the shared folder.

When I go through 'My Network Places' on the XP box I can see the Linux box.

When I click on it to connect, it brings up a dialogue requesting a username and password, so I fill this in with the username and password I am already logged in with on the Linux box, and click on 'OK' but the dialogue just pops up again without connecting.

It is as though the Linux box is not recognising the credentials, or not authorising them.

Any ideas where I should start looking?
Thanks!