fatal: no matching mac found

One of my clients was trying to connect, for the first time, on his brand new server..
Somehow he wasn’t able to connect….

He showed me the following *log/report*…

Status:    Waiting to retry...
Status:    Connecting to 37.XX.XX.XX...
Response:  fzSftp started
Command:   open "[email protected]" 22
Error:     Server unexpectedly closed network connection
Error:     Could not connect to server

and this is the auth.log on the server…

fatal: no matching mac found: client hmac-sha1,hmac-sha1-96,hmac-md5 server [email protected],hmac-sha2-256-$

Update the SFTP client – in this case filezilla -.


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