[PATCH] param: disable print notify backchannel by default

[David Disseldorp]

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:

https://blogs.technet.com/b/askperf/archive/2009/01/16/understanding-print-notifications-in-windows-vista.aspx?Redirected=true

Cheers, David