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Unable to connect FTP over TLS from z/OS to Ubuntu 20.04

cn flag

Has anyone succedded in sending files via FTPs from z/OS to VSFTP or PROFTPD on Ubunto 20.04? I have been trying for a couple of days to figure out how this could work with not much success....always getting this error:

error:14209102:SSL routines:tls_early_post_process_client_hello:unsupported protocol

I followed the guidlines here:

https://www.ibm.com/docs/en/zos/2.4.0?topic=security-steps-customizing-ftp-client-tls

Linux system running on Ubunto 20.4, z/os is version 2.4

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