I have been backing up my robots with batch file that uses ftp for a while now without issues. Yesterday I tried to tie that batch file to the windows task scheduler and in the process went a little crazy and did multiple backups in a short time while trying to make it work - not sure if that was the starting point of the issue, but it seems that way. Since then, some, but not all, robots do not respond to Ftp anymore. I can still ping them and even use the webserver.
Any idea what might be happing? If we wouldn't run production 24/7 I would reboot the controller, but did not have the chance yet.