FTPS not working - unable to accept TLS connection: system call error: [0] Success  [SOLVED]

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curiousclumsy
Posts: 6
Joined: Tue 19. Jan 2021, 09:32

FTPS not working - unable to accept TLS connection: system call error: [0] Success

Post by curiousclumsy »

I can't see to make FTPS to work.

I have tried Explicit Mode and different FTP clients without success.
syslog doesn't have anything that can help.

Is there anything I can try to pinpoint the issue?

Thanks



/var/log/proftpd/tls.log

Code: Select all

2022-01-28 08:55:15,493 mod_tls/2.7[1017941]: TLS/TLS-C requested, starting TLS handshake
2022-01-28 08:55:35,612 mod_tls/2.7[1017941]: unable to accept TLS connection: system call error: [0] Success
2022-01-28 08:55:35,612 mod_tls/2.7[1017941]: TLS/TLS-C negotiation failed on control channel
Filezilla

Code: Select all

Status:      	Disconnected from server
Status:      	Connecting to XXXXXX:21...
Status:      	Connection established, waiting for welcome message...
Status:      	Initializing TLS...
Error:        	Connection timed out after 20 seconds of inactivity
Error:        	Could not connect to server
Status:      	Waiting to retry...
Status:      	Connecting to XXXXXX:21...
Status:      	Connection established, waiting for welcome message...
Response: 	220 ProFTPD Server (server1.XXXXXXXXXX.co.uk FTP-Server) [::ffff:XXXXXX]
Command:	AUTH TLS
Response: 	234 AUTH TLS successful
Status:      	Initializing TLS...
Error:        	Connection timed out after 20 seconds of inactivity
Error:        	Could not connect to server
Attachments
Screenshot 2022-01-28 at 10.05.28.png
Screenshot 2022-01-28 at 08.56.07.png
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Alexander
Keyweb AG
Posts: 3810
Joined: Wed 20. Jan 2016, 02:23

Re: FTPS not working - unable to accept TLS connection: system call error: [0] Success  [SOLVED]

Post by Alexander »

Hello,

Please attach a more detailed log from your FileZille (or other FTP client). That way you could see which TLS version is used to establish the connection.

However, I think this is more of a problem with proFTPD (the FTP server software running on the KeyHelp machine) and most likely has nothing to do with the way KeyHelp sets up this FTP server.
Perhaps it is probably better to address this issue directly to the proFTPD developers: https://github.com/proftpd/proftpd/issues

Here are some threads with the same error message you received:
https://github.com/proftpd/proftpd/issues/1151
https://github.com/proftpd/proftpd/issues/618
Mit freundlichen Grüßen / Best regards
Alexander Mahr

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Keyweb AG - Die Hosting Marke
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