Hello everyone,
I'm seeking help with the setup of an FTP server on a Raspberry Pi running the latest Pi OS that can receive surveillance clips from a RLC-520 (running the latest firmware).

I set up the vsftpd service and checked that it works with filezilla on a separate machine: I'm in fact able to log in and create folders/files. However, I cannot get it to work with my RLC-520.
For the record, I did run "Test FTP" on port 21 (which works on filezilla) as well as ports 20, 22, 1935, 9000, 14147, 37777 (as recommended on other websites), but it always fails.

ufw is running on the pi with the following ports open (I did try to open them one after another for trial and error's sake):
20, 21, 22, 80, 443, 554, 1935, 989, 990, 5000:10000, 14147, 37777.

Looking forward to any suggestion.

Thank you!