Server authentication none fails to connect

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Hi All,

I am trying to understand why openssh client started failing to establish a 
connection.  The client is running on Mint Linux and was able to connect to 
this server until recently without problems.  Now when it tries to connect 
(using sftp), it fails like so:

$ sftp -v user_name@host_name.netsolhost.com:/
OpenSSH_7.2p2 Ubuntu-4ubuntu2.1, OpenSSL 1.0.2g  1 Mar 2016
[snip ...]

debug1: Host 'account_name.netsolhost.com' is known and matches the RSA host 
key.
debug1: Found key in /home/mick/.ssh/known_hosts:1
debug1: rekey after 4294967296 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: rekey after 4294967296 blocks
debug1: SSH2_MSG_NEWKEYS received
debug1: Authentication succeeded (none).
Authenticated to account_name.netsolhost.com ([206.188.193.57]:22).
debug1: channel 0: new [client-session]
debug1: Entering interactive session.
debug1: pledge: network
debug1: channel 0: free: client-session, nchannels 1
debug1: fd 0 clearing O_NONBLOCK
Connection to account_name.netsolhost.com closed by remote host.
Transferred: sent 1560, received 1992 bytes, in 0.0 seconds
Bytes per second: sent 18334897.2, received 23412253.3
debug1: Exit status -1
Couldn't read packet: Connection reset by peer


What is the meaning of the message: "Authentication succeeded (none)."?

Shouldn't the server respond with a list of authentication method names, and 
authentications that can continue, including as in the past "password"?

-- 
Regards,
Mick

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