[openssl-users] Help with "tlsv1 alert insufficient security"

Joseph Southwell jsouthwell at serengeti.com
Fri Feb 24 16:15:43 UTC 2017

We upgraded from 0.9.8 to 1.0.2 and now we are seeing that message when we try connecting to a server that previously worked. What does it mean and how can I figure out how to work around it? I can’t get the server to change anything and I need to be able to continue connecting to it. 

openssl s_client -connect xxxxxxx.com <http://xxxxxxx.com/>:#### -starttls ftp

4960:error:1407742F:SSL routines:SSL23_GET_SERVER_HELLO:tlsv1 alert insufficient security:.\ssl\s23_clnt.c:770:
no peer certificate available
No client certificate CA names sent
SSL handshake has read 88 bytes and written 317 bytes
New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
    Protocol  : TLSv1.1
    Cipher    : 0000
    Key-Arg   : None
    PSK identity: None
    PSK identity hint: None
    SRP username: None
    Start Time: 1487578706
    Timeout   : 300 (sec)
    Verify return code: 0 (ok)

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