Vista client + NetBIOS session setup message

Christopher R. Hertel crh at
Wed Feb 20 22:10:53 GMT 2008


I don't have Vista available to me, so I am doing a good deal of guesswork
here, but my guess is that the NetBIOS Session Setup Request message would
be used if the Vista CIFS client resolved the name via the NBT name service
rather than the DNS.

With older Windows flavors (W2K is what I've tested), if you send a NetBIOS
Session Setup Request to port 445 the request is ignored and you time out
waiting for a reply.  The Session Setup Requests were handled properly on
port 139.

Is this anywhere close to what you're asking about?

Chris -)-----

Todd Stecher wrote:
> I'm looking at a way to trigger a NBSS message from Vista.  On our
> 3.0.24 distro, Vista clients at our customer site send a NBSS request,
> get back the response, and then disconnect the session.  Here's the cap
> + associated log entry.
> sloisn01-1: [2008/01/14 16:33:46, 0, pid=77015, effective(0, 0), real(0,
> 0)] lib/util_sock.c:write_data(563)
>   write_data: write failure in writing to client Error
> Broken pipe
> sloisn01-1: [2008/01/14 16:33:46, 0, pid=77015, effective(0, 0), real(0,
> 0)] lib/util_sock.c:send_smb(1016)
>   Error writing 4 bytes to client. -1. (Broken pipe)
> I didn't think anyone used NBSS messages anymore, and I'm having a
> degree of difficulty getting an in-house repro on my Vista client, since
> it always seems to skip NBSS.
> 1) Is there any way to send this message via SMBTorture?
> 2) Does anyone know how to get Vista to emit this message?  I'm guessing
> its join state + some mystery policy cause Vista to try NBSS, but I've
> been unable to unravel the mystery.
> Todd Stecher | Windows Interop Dev
> Isilon Systems    P +1-206-315-7500     F  +1-206-315-7501
>    D +1-206-315-7638    M +1-425-205-1180

"Implementing CIFS - the Common Internet FileSystem"    ISBN: 013047116X
Samba Team --    -)-----     Christopher R. Hertel
jCIFS Team --  -)-----  ubiqx development, uninq
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