Symptoms
Assume that you are using Microsoft BizTalk Server 2013 R2. When you configure the SFTP receive location by using the default setting of the SFTP adapter to poll SFTP servers every 0 seconds, you may experience high CPU usage on both the BizTalk server and the SFTP server.
Cause
The issue occurs because the default polling interval of the SFTP adapter is 0 seconds. If the SFTP servers are local and have low latency, this polling interval can result in continuous polling. This may cause high CPU usage in the BizTalk process or the SFTP server process, especially on servers that have only a few CPU cores installed.
Resolution
Cumulative update information
This issue was first fixed in the following cumulative update for BizTalk Server:
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
For information about the service packs and cumulative update list for BizTalk Server, see KB 2555976: Service pack and cumulative update list for BizTalk Server.
For more information about BizTalk Server hotfixes, see KB 2003907: Information about BizTalk hotfixes and Service Pack support.
