Using winscp I'm now at:
. 2018-06-20 09:21:59.276 GSSAPI authentication request refused
. 2018-06-20 09:21:59.276 Disconnected: No supported authentication methods available (server sent: publickey,gssapi-keyex,gssapi-with-mic)
* 2018-06-20 09:21:59.306 (EFatal) Disconnected: No supported authentication methods available (server sent: publickey,gssapi-keyex,gssapi-with-mic)
* 2018-06-20 09:21:59.307 Authentication log (see session log for details):
* 2018-06-20 09:21:59.308 Unable to load private key file "C:\Program Files\PuTTY\key\private.ppk" (file format error)
* 2018-06-20 09:21:59.308 Using username "ocart".
* 2018-06-20 09:21:59.308
* 2018-06-20 09:21:59.308 Authentication failed.

or maybe
. 2018-06-20 09:23:56.278 Host key matches cached key
. 2018-06-20 09:23:56.279 Host key fingerprint is:
. 2018-06-20 09:23:56.279 ssh-rsa 2048 44:ed:41:7a:e3:b2:2f:8b:53:8d:64:31:df:7b:a2:bd
. 2018-06-20 09:23:56.279 Initialised AES-256 SDCTR client->server encryption
. 2018-06-20 09:23:56.279 Initialised HMAC-SHA-256 client->server MAC algorithm
. 2018-06-20 09:23:56.279 Initialised AES-256 SDCTR server->client encryption
. 2018-06-20 09:23:56.279 Initialised HMAC-SHA-256 server->client MAC algorithm
. 2018-06-20 09:23:56.776 Received disconnect message (protocol error)
. 2018-06-20 09:23:56.776 Disconnection message text: bad service request ssh-connection
. 2018-06-20 09:23:56.777 Server sent disconnect message
. 2018-06-20 09:23:56.777 type 2 (protocol error):
. 2018-06-20 09:23:56.777 "bad service request ssh-connection"
* 2018-06-20 09:23:56.836 (EFatal) Server sent disconnect message
* 2018-06-20 09:23:56.836 type 2 (protocol error):
* 2018-06-20 09:23:56.836 "bad service request ssh-connection"
* 2018-06-20 09:23:56.836 Authentication failed.

Or filezilla:
Status:    Connecting to shelterbedsdev.com...
Response:    fzSftp started, protocol_version=4
Command:    keyfile "C:\Program Files\PuTTY\key\private.ppk"
Command:    open "ocart@shelterbedsdev.com" 22
Error:    Disconnected: No supported authentication methods available (server sent: publickey,gssapi-keyex,gssapi-with-mic)
Error:    Could not connect to server