On the latest firmware, v1.02.03, I’ve been having problems connecting to my MBL using my usual ftp client, Filezilla. Connection through a web browser are fine but dosn’t allow server uploads.
After activating ssh and getting access to vsftpd’s.conf configuration file I found out that the problem was the max_per_ip=1 setting.
This has been changed from it’s default 0 (Unlimited) setting to 1 which limits the max amount of clients that can connect from the same source IP address.
After changing this setting back to it’s default setting I was able to connect without problems with my ftp client. Seems ftp cliente software, or Filezilla at least, uses more than one connection to connect to the server.