125 Dataconnection already open, starting -> 426 Connecti

[support2]

Thank you for the reply. Filezilla isn't installed at the other machine. I tried the ftp cmd client at that machine and indeed the dataconnection is blocked. So I send a request to open the firewalls.


I should have known this myself. I tried to open a ftp connection from the client machine to the server but didn't try uploading a file . From the dev machine I tried uploading one and that one succeeded.

[support2]