I have recently added an ED25519 Hostkey to my SFTP Server. After adding it I tried to test it by connecting to my server using WinSCP v6.3.3.
I received the following error:
Remote side sent SSH2_MSG_EXT_INFO not either preceded by NEWKEYS or followed by USERAUTH_SUCCESS
I have the option to
'Reconnect', which I do...and after several attempts it connects successfully. Sometimes I connect and I don't get the error at all.
I have connected using an alternative SFTP client (OpenSSH on Windows 11) and I don't seem to get this error at all.
Please find below an extract from my WinSCP Log.
. 2024-05-07 15:42:25.511 Host key fingerprint is:
. 2024-05-07 15:42:25.511 ssh-ed25519 255 SHA256:<hidden>
. 2024-05-07 15:42:25.511 Verifying host key ssh-ed25519 <hidden> with fingerprints ssh-ed25519 255 SHA256:<hidden>, ssh-ed25519 255 <hidden>
. 2024-05-07 15:42:25.527 Host key matches cached key
. 2024-05-07 15:42:25.527 Initialised AES-256 SDCTR (AES-NI accelerated) [aes256-ctr] outbound encryption
. 2024-05-07 15:42:25.527 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2024-05-07 15:42:25.527 Detected network event
. 2024-05-07 15:42:25.527 Waiting for the server to continue with the initialization
. 2024-05-07 15:42:25.527 Initialised AES-256 SDCTR (AES-NI accelerated) [aes256-ctr] inbound encryption
. 2024-05-07 15:42:25.527 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2024-05-07 15:42:25.622 Detected network event
. 2024-05-07 15:42:25.622 Waiting for the server to continue with the initialization
. 2024-05-07 15:42:25.622 Remote side sent SSH2_MSG_EXT_INFO not either preceded by NEWKEYS or followed by USERAUTH_SUCCESS
. 2024-05-07 15:42:25.622 Attempt to close connection due to fatal exception:
* 2024-05-07 15:42:25.622 Remote side sent SSH2_MSG_EXT_INFO not either preceded by NEWKEYS or followed by USERAUTH_SUCCESS
. 2024-05-07 15:42:25.622 Closing connection.
* 2024-05-07 15:42:25.669 (EFatal) Remote side sent SSH2_MSG_EXT_INFO not either preceded by NEWKEYS or followed by USERAUTH_SUCCESS
* 2024-05-07 15:42:25.669 Authentication failed.
Any help would be appreciated!
Kind regards,
Lee