[PATCH] param: disable print notify backchannel by default

David Disseldorp ddiss at suse.de
Tue Oct 15 04:05:33 MDT 2013

On Mon, 14 Oct 2013 13:53:22 +0200
David Disseldorp <ddiss at samba.org> wrote:

> In handling RemoteFindFirstPrinterChangeNotifyEx requests, the spoolss
> server can establish a "backchannel" connection to the print client, as
> a mechanism for sending print notifications. This behaviour is governed
> by the "print notify backchannel" smb.conf parameter.
> This change sets "print notify backchannel" to "no" by default, which
> sees Samba respond to RemoteFindFirstPrinterChangeNotifyEx requests with
> WERR_SERVER_UNAVAILABLE. In recieving such a response, print clients can
> fall back to polling for print queue changes.

For the record, I expect print clients since Windows Vista have not
accepted back-channel connections without manual registry changes:


Cheers, David

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