The problem is "Connection Refused", meaning the machine you are trying to connect doesn't offer any service on the selected port.

Did you try to Telnet to port 139 on the target machine?

Also, just because 21 and 80 work doesn't mean 139 will.

Finally, Connection Refused has nothing to do with user, pass or share name. It is an IP (TCP) error that indicates that it cannot connect to the said machine because the machine has the selected port closed.

This means that the machine is reachable, in order to refuse anything, otherwise it would be a timeout.

If you get ECONNREFUSED by N900 and not by laptop I can imagine only one scenario: the laptop logs in to the Netware server before, thus allowing further services, whereas the N900 cannot.

If you have multiple machines on the network, share a folder on any one of them in an XP machine and try to connect to that. If it works, it's likely a logon issue by the Netware Client for MS Windows (which logs on before trying).

This is, again, assuming you didn't get a typo through in the IP address.

There is no more help to be given by a console. Once a SYN has been sent, the other computer replies "there is no SMB share here. Beat it." I very much doubt the router returns a faked packet so I'm pretty much sure the server denied you access.

Don't know how newer Novell works, but in older versions one needs to log on to the server before accessing anything.

I strongly recommend you set up another share on the same LAN and try that, maybe using the laptop over the wired connection, and just share "C" or something.

If it works, it's a server issue, most likely logon-first which is not going to be fixed soon by WM. If doesn't and you also get a Connection Refused, it means that a common equipment is playing tricks, and the only one there is the w-router.

ETA:

It has come to me that you might have port forwarding gone in the router, meaning that packets could be forwarded to an IP reserved for the laptop. This would get you a timeout, likely, but it might be worth digging up. Port forwarding could push your packets to a different IP, for example to the laptop when wired or wireless, getting you a ECONNREFUSED.