Wednesday, April 06, 2022

TLS library problme: tlsv1 alert protocol

Hi *,
I've noticed on my mail relays, that tls handshake with one certain email relay keep failing. I was wondering what the
reason for that may be.

Following error from postfix:

connect from mout.web.de[ IP ]:44003
SSL_accept error from mout.web.de[ IP ]:44003: -1
warning: TLS library problem: error:1404A42E:SSL routines:ST_ACCEPT:tlsv1 alert protocol version:/usr/src/lib/libssl/tls13_lib.c:150:
lost connection after STARTTLS from mout.web.de

Can anybody with more knowledge of libressl and it's error messages tell by this error what is wrong?

Best regards,
Stephan

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