When you use Microsoft BizTalk Server SFTP adapter with an older version of WinSCP to send and receive messages, you may be unable to take advantage of improvements that are made by WinSCP. Specifically, you may notice that the receive locations become irresponsive intermittently. To avoid this issue, WinSCP is upgraded to 5.15.9 or later versions.
This update is available in the following cumulative update for BizTalk Server:
Cumulative Update 7 for BizTalk Server 2016
For information about the service packs and cumulative update list for BizTalk Server, see the following article in the Microsoft Knowledge Base:
2555976 Service pack and cumulative update list for BizTalk Server
For more information about BizTalk Server hotfixes, see the following article in the Microsoft Knowledge Base:
2003907 Information about BizTalk hotfixes and Cumulative Update support