INFO: Registry Key to Change the Default ExpiresAT Value for BizTalk Reliable Messages

Microsoft BizTalk Server Reliable Messaging is a feature of the BizTalk Framework 2.0 protocol that supports guaranteed, one-time-only delivery of documents in heterogeneous environments across the Internet. In accordance with the BizTalk Framework specification, documents that are wrapped in a Reliable SOAP envelope are automatically configured with an ExpiresAT value that marks the time at which the document is no longer considered valid for delivery.

The ExpiresAT value for a Reliable document is determined by the following formula: The total number of tries is the number of configured retries plus one for the first try. For example, if you configure a Messaging Channel with four retries at a two-minute interval, the document expiration time is the following: When the ExpiresAT value of a Reliable document has been exceeded, you cannot resubmit the document for transmission to a trading partner. Under certain circumstances, you may want to override the default calculated ExpiresAT value for Reliable messages that you send from your BizTalk Server. To override the default calculated ExpiresAT value for Reliable messages on the BizTalk Server computer that sends the messages, change the registry key as described in the "More Information" section of this article.

WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

1. Start Registry Editor.
2. Locate, and then click the following key in the registry:
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\BTSSvc
3. On the Edit menu, click Add Value, and then add the following registry values to modify the ExpiresAT value for Reliable documents:
   Value name: BTFMsgTTL
   Data type: REG_DWORD
   Radix: Decimal
   Value data: <Type the value in minutes here>
4. Quit Registry Editor.

NOTE: The unit of measure for the BTFMsgTTL registry key is minutes. Therefore, a value of 43200 sets the ExpiresAT value 30 days from the day that the document is originally submitted.