Assume that you are using Microsoft BizTalk Server Secure File Transfer Protocol (SFTP) adapter to send and receive messages. When you have several receive locations on the same host, you may notice that the SFTP adapter receive locations stop working intermittently during higher load.
This issue is fixed in the following cumulative update for BizTalk Server:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For information about the service packs and cumulative update list for BizTalk Server, click the following article number to view the article in the Microsoft Knowledge Base:
2555976 Service pack and cumulative update list for BizTalk Server
For more information about BizTalk Server hotfixes, click the following article number to view the article in the Microsoft Knowledge Base:
2003907 Information about BizTalk hotfixes and Service Pack support