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Could not connect to FTP

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Hi,

Since yesterday I can't connect to any of my ftp clients.

For months I could login to my FTP using Coda and Filezilla and everything worked until yesterday.

Coda gives me this message:
Error -203: miscellaneous error occurred while trying to login to the host

Filezilla gives me this message:
Antwoord:220 ProFTPD 1.3.5 Server (ProFTPD) [MYSERVERIP]
Opdracht:USER username (username is my ftp username)
Antwoord:550 SSL/TLS required on the control channel

I have not changed anything on my server. Just out of the blue this errors appears and now my customers and I can't login anymore.

I tried to restart the server, made a new ftp account, but nothing seems to resolve the problem...

Does somebody knows what to do? I don't know if I can reinstall the ProFTPD or need to open port 21?
Any idea is welcome!
 
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