3509849 - 'couldn't be established' error in SAP Datasphere when using Generic SFTP connection

While setting up the Generic SFTP connection from SAP Datasphere to SFTP server, the following errors appears:

• Connection <SFTP NAME> couldn't be established.
  - Data flows can't be used because of errors in the connection.
  - Replication flows are not supported.
  - Remote tables are not supported.
  Data Flows: Cause: Possible causes of error: Detailed error message (hostkey has been changed for remote host (<SFTP URL>))
  

• Connection <SFTP NAME>  couldn't be established.
  - Data flows can't be used because of errors in the connection.
  - Replication flows are not supported.
  - Remote tables are not supported.
  Data Flows: Cause: Possible causes of error: Detailed error
  message connection is closed by foreign host)
  

"Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental."

• SAP Datasphere
• Generic SFTP

Sftp, ftp, protocol, matching, host, key, hostkey, pem, certificate, how, to generate, server , KBA , DS-DI-CON , Connections , Problem