|Source:||MSExchange Unified Messaging|
|Message:||The Unified Messaging server failed to exchange the required certificates with an IP gateway to enable Transport Layer Security (TLS) for an incoming call. Check that this is a configured TLS peer and that the correct certificates are being used. More information: %1.|
This Warning event indicates that the Transport Layer Security (TLS) handshake has failed on an incoming call to the computer that is running the Unified Messaging server role. TLS handshake is responsible for connection establishment, encryption keys negotiation, certificates exchange, and authentication between the Unified Messaging (UM) server and IP/VoIP gateway. This event may be caused by one or more of the following:
To resolve this error, do one or more of the following:
If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.