Issue 026 - DPWS - WS-Eventing does not work when subscriber in notaddressable

[Ram Jeyaraman <Ram.Jeyaraman@microsoft.com>]

This issue is assigned the number 026. For further discussions on this issue, please refer to this issue number or use this thread.

-----Original Message-----
From: Antoine Mensch [mailto:antoine.mensch@odonata.fr]
Sent: Tuesday, September 16, 2008 4:36 PM
To: Ram Jeyaraman
Subject: NEW Issue - WS-Eventing does not work when subscriber in not addressable

Please defer discussions on this issue until a time this issue is
accepted and is assigned a number.

Document: DPWS
Location (defaults to line number): WS-Eventing
Owner: Antoine Mensch

Description:
The current WS-Eventing mechanism selected by DPWS is based on a push
mechanism which requires the event source to connect to the subscriber
to deliver the event notification. This creates problems in to very
common cases: (i) when the subscriber is behind a firewall using NAT;
(ii) when the subscriber is a Web application (e.g. Ajax or Java, Flash
or Silverlight applets) which cannot accept incoming connections.

Proposed resolution:
It would be very useful to design a mechanism allowing event sources to
use long-lived connections established by the subscriber to deliver the
event notifications.