Problem

When a new FTP server connection is created with same user as an existing one, activation fails but the new configuration is copied to $ACTISEDI/is/instances/is0/config/ftpserver/ftp_server.cfg.
At the next startup, FTPSERVER service goes on error and does not start anymore.

Resolution

The problem comes from the predefined 'axway' FTP server account, which has no slave attached.
Usually, when the user is trying to create another FTP account, the server will invalidate the request if there is already an existing username-slave pair configured.
In this case, because of missing slave property, the new configuration has been validated, but the activation of the FTP server failed due to multiple 'axway' user names found.
The default entry 'axway' should be updated to be associated with all slaves or a particular one.
Attached archive contains the sql script to update the default entry 'axway' and another script to revert the change.