Unable to connect to SFTP server

Error
--------
Host is not communicating for more than 15 seconds. Still waiting… Warning: Aborting this operation will close connection!
It was working fine until 09/01/2026

Winscp log
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. 2026-09-09 11:25:23.301 Looking up host "interface.us.wfs.cloud" for SSH connection
. 2026-09-09 11:25:23.302 Connecting to 158.101.9.121 port 22
. 2026-09-09 11:25:23.342 Connected to 158.101.9.121 (from 10.72.81.15:63114)
. 2026-09-09 11:25:23.385 We claim version: SSH-2.0-WinSCP_release_6.5.7
. 2026-09-09 11:25:23.385 Connected to 158.101.9.121 (from 10.72.81.15:63114)
. 2026-09-09 11:25:23.404 Remote version: SSH-2.0-OpenSSH_7.4
. 2026-09-09 11:25:23.404 We believe remote version has SSH-2 RSA/SHA-2/certificate userauth bug
. 2026-09-09 11:25:23.404 Using SSH protocol version 2
. 2026-09-09 11:25:23.410 Have a known host key of type ssh-ed25519
. 2026-09-09 11:25:39.863 Waiting for data timed out, asking user what to do.
. 2026-09-09 11:25:39.863 Asking user:
. 2026-09-09 11:25:39.863 **Host is not communicating for 15 seconds.
. 2026-09-09 11:25:39.863
. 2026-09-09 11:25:39.863 Wait for another 15 seconds?** ()
. 2026-09-09 11:25:42.894 Data has arrived, closing query to user.
. 2026-09-09 11:25:42.905 Answer: OK
. 2026-09-09 11:25:42.905 Network error: Software caused connection abort
* 2026-09-09 11:25:42.966 (EFatal) Network error: Software caused connection abort