SFTP failed to download big files because when using certain ciphers

When download some big files using sftp command, it could download some files then failed error:
Disconnecting: Protocol error: expected packet type 31, got 94

This cause could be the SSH/SFTP server does not handle the SSH Rekey request when using certain ciphers.

The solution could be:

1). specifying a cipher that is supported by the SSH/SFTP server or 2). incresing the SSH RekeyLimit.

sftp -o User=domain:user -o Ciphers=aes128-ctr -o RekeyLimit=1G your-sftp-server.org

See also

• ssh session rekeying
• How to force SFTP to use a specific cipher
• https://github.com/net-ssh/net-ssh/issues/188
• OpenSSH RekeyLimit