I recently changed version of Filezilla. With the previous I could connect to the server and make transfers without worry but since the upgrade, I can connect to the server.
Error: Unable to connect to server (Error 530: account is already in use)
- File > Site Manager > Transfer Settings > tranfer mode (Passive) and check the "Limit number of simultaneous connections" and put "1".
Thanks to Curtis Hayes
for this tip.