Duplicate messages received by BizTalk

I recently witnessed an issue with AIF in Dynamics AX 2009. The system uses BizTalk adapter to send messages to a subsystem. It was working fine till recently. All of a sudden, we found that BizTalk is receiving multiple messages for each message sent out of AIF.

Here are the symptoms:

• Send messages out of AX using AIF
• Message is successfully sent out and can be seen in document history
• After that, message stays in AIF Queue manager for 10-15 minutes
• In these 10-15 minutes, BizTalk receives the same message multiple times(5-12 times)

What we tried:

• Running AIF receive/send related 4 classes using a job
• Tweaking AIF global settings (disable caching etc)
• Restart AOSes (its a clustered environment)
• shut down one AOS and one BizTalk instance
• No luck after all the above

Here is the solution proposed by MS support:

• Create a new configuration and restart AOS and BizTalk
• Duplicate issue is resolved
• We reverted to the original configuration but Duplicate issue didn't arise

I suspect some where sessions/previous Business connection session information is stuck and the new configuration cleared it up.

Dynamics AX 2009 BizTalk Adapter issue

When ever we change AIF configuration in DAX 2009, we refresh services and sometimes restart AOS to refresh business connector sessions.

However, recently we found that we need to restart BizTalk host instances as well. We never had this issue before. It looks like this is an adhoc issue.

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