http://developers.de/blogs/damir_dobric/archive/2010/05/23/httpnotificationchannel-open-fails-with-notificationchannelopenexception.aspxWhen trying to register the channel for notifications, you may notice that callback handler ‘ ChannelUriUpdated’ is never invoked. If that happens register the callback ‘ ExceptionOccurred’ . This will give you a chance to receive the exception, whichenCommunityServer 2008 SP1 (Build: 30619.63)http://developers.de/blogs/damir_dobric/archive/2010/05/23/httpnotificationchannel-open-fails-with-notificationchannelopenexception.aspx#12636Thu, 03 Jun 2010 19:48:15 GMT7e491611-45ad-4dae-a68f-c4cb64439510:12636Mark Lambert<p>This was not obvious while playing around in a sandbox application. &nbsp;Thank you for saving me some time researching this further.</p> <div style="clear:both;"></div><img src="http://developers.de/aggbug.aspx?PostID=12636" width="1" height="1">http://developers.de/blogs/damir_dobric/archive/2010/05/23/httpnotificationchannel-open-fails-with-notificationchannelopenexception.aspx#12619Wed, 02 Jun 2010 15:53:55 GMT7e491611-45ad-4dae-a68f-c4cb64439510:12619Neil Rees<p>Thanks!</p> <div style="clear:both;"></div><img src="http://developers.de/aggbug.aspx?PostID=12619" width="1" height="1">