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
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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
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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