It appears as though even the newest versions of ARCHIBUS are shipping with an SFTP .jar/library for use with the connectors which is no longer supported by a number of SFTP hosts as it is out of date.

The current edtftpj-pro.jar file appears to have been procured from the third part vendor enterprisedt.com and is version 5.2.4 which was released back in 2017. There have been 10 subsequent releases with the latest being v7.1.0.

SFTP based export connectors are no longer usable without work arounds for a number of clients as a result.