I had/have this issue after upgrading my OCS 2007 R1 to OCS 2007 R2. Directly after the OCS upgrade, SCOM (2007 R1) notifications stopped working with "Alert: Failed to send notification using server/device". Other than changing the pool name in the global management group settings, nothing had really changed on the SCOM side. Important to note that I also eliminated TCP 5060 in the new OCS R2 deployment and use only MTLS 5061, so SCOM was also reset to TLS and 5061. As a test, I added TCP 5060 back in the OCS 2007 R2 FE and changed SCOM settings to reflect it. Low and behold, IM's started flying in. ok, but that’s not very secure and I would like to get MTLS working. I thought that maybe it was a certificate issue, so I exported the machine certificates from SCOM and OCS servers and imported them into the corresponding server. It’s still not working with TLS or MTLS. Any ideas?

Hi, I just got the following posts and would like to share with you for your reference: SCOM 2007 SP1’de Instant Messaging Notification Yaplandrmas http://blogs.msdn.com/b/scstr/archive/2010/03/29/scom-2007-sp1-de-instant-messaging-yap-land-rmas.aspx OpsMgr R2, Notifications – Setting up Instant Message (IM) Channel http://thoughtsonopsmgr.blogspot.com/2009/10/opsmgr-r2-notifications-setting-up.html Please Note: Since the website is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information. Hope these can give you some hints. Thanks.Nicholas Li - MSFT Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

I translated the first link from turkish to english. Unofrtunatly no help. I had read the the second link previously. It also does not help me. I have since upgraded to SCOM 2007 R2 (new server). and of course TLS Still does not work for me. Alert: Failed to send notification using server/device Source: Microsoft.SystemCenter.NotificationServer Path: oscpool01.domain.com Last modified by: System Last modified time: 1/4/2011 12:18:34 PM Alert description: Notification subsystem failed to send notification using device/server 'ocspool01.domain.com ' over 'sip' protocol to 'sip:mysipacct@.domain.com. Microsoft.Collaboration.RegisterException: Transport error occurred while sending.: Sip response: (0x0). Rule id: Subscriptionbc9a39f3_3a0e_4f9a_9325_733eb33219f8 telnet to ocspool01.domain.com 5061 connects no problem. Bret