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What are the authorised protocols for logging in to the ProFTPD servers?
You can use an active or passive connection type, both work. Test one or the other if concerned.
The configuration on our Proftpd is as follows:
PassivePorts 42000 44000
You can create SFTP connections. This requires SSH and port 22: sftp://*****.
You can use FTPES (ftpes://*****) with port 21 and SSL/TLS encryption with Filezillak, for example by selecting the "Explicit FTP connection on TLS" encryption .
Ftpaccess is available.
You can not login as a public / anonymous user.
FTPs is not supported (le port 2121 is not open).