When this issue occurs, you receive the following error message:
A message sent to adapter "SFTP" on send port "SFTPSendPort" with URI "<File Path>" is suspended.
Error details: Microsoft.BizTalk.Adapter.SftpInvoker.SftpException: Open SFTP connection error.
Note This issue does not occur in other SFTP clients, such as PuTTY or PSFTP.
Cumulative update information
BizTalk Server 2013 R2
The fix that resolves this issue is included in Cumulative Update 1 for BizTalk Server 2013 R2.
BizTalk Server 2013
The fix that resolves this issue is included in Cumulative Update 3 for BizTalk Server 2013.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about the service packs and the 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 cumulative update support.