SFTP server software will be upgraded to the latest patch levels, and SSL certificates will be renewed. 

There should be no interruption to end users during the upgrade. SFTP host fingerprints will not change, but FTPS services after the switch will operate under an updated SHA-256 SSL certificate. The change in SSL certificate may cause some automated jobs to require confirmation after the initial upgrade is complete. It is recommended that any customers with automated jobs run their jobs manually after the updates to ensure the certificates are still trusted, and jobs are still running correctly.