Plain FTP is insecure. Please switch to FTP over TLS

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Yovi
500 Command not understood
Posts: 1
Joined: 2020-04-16 12:40

Plain FTP is insecure. Please switch to FTP over TLS

#1 Post by Yovi » 2020-04-16 12:45

Hi

I'm using the latest version of FileZilla and I'm looking to connect to a server using plain FTP. Option FTP over TLS is not used by the hosting, so only plain FTP.
When using plain ftp I get the belows logs. The support from the hosting company tried to connect and it worked . Only difference is that he is using Filezilla.3.43.7 while I'm using 3.47.2.1 .

Thanks for the help. I've hidden the host name and user but I'm sure the credentials are correct.

Status: Resolving address of [correct hosting)
Status: Connecting to 185.162.30.223:21...
Status: Connection established, waiting for welcome message...
Response: 220 ProFTPD Server (FTP Server) [185.162.30.223]
Status: Plain FTP is insecure. Please switch to FTP over TLS.
Command: USER [this is the USER, HIDDEN for privacy)
Response: 500-Unrecognized command format. Please provide user and password information according to
Response: 500-the following format:
Response: 500- User: [proxy_user:[proxy_passwd:[proxy_token:]]]remote_user
Response: 500- Pass: [proxy_passwd:[proxy_token:]]remote_passwd
Response: 500

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botg
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Posts: 35507
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Re: Plain FTP is insecure. Please switch to FTP over TLS

#2 Post by botg » 2020-04-16 13:24

It appears there is a malicious firewall or NAT router manipulating the traffic and injecting forged replies.

Get rid of all firewalls and NAT routers and try again.

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