After upgrade from versions 8.7.x or 8.8.X to 9.0.x FTPS listeners are not started
Post upgrade from version 8.7.X directly to version 9.0.X the FTPS listener wont function as the Default SSL cert associated with the FTPS listener over Port 21 and 990 are 1024 bit Certs. Same issue can occur when WSFTP Server is upgraded from 8.8.X to 9.0.X. When user upgrades from any version lower than 9.0 to the latest (9.0.2) the FTP listeners would not function as the default Certificate associated are 1024 bit.