Load Balancer does not support passive FTP.
To enable active FTP:
- Add port 20 and port 21 to the cluster.
- Configure crossport affinity between port 20 and 21. This allows
the data connection to go to the same server as the corresponding
connection for the FTP command.
- Set the selection algorithm for port 20 and 21 to affinity or
conn+affin.
Refer to the topic on optimizing connections with client-to-server
affinity for information on crossport affinity and selection algorithms.