We had to update a web server to get ahead of several EOL issues related to software we were running. Now that we have upgraded, our client is unable to connect to pick up files they need to pick up on a cron schedule. They are currently using WinSCP version 5.13.4 and they're an enterprise-level client that can't just update these things easily.
We tested this issue using version 5.13.4 and received the exact same error they did:
Disconnected: No supported authentication methods available (server sent: publickey)
We tested with the latest version of WinSCP (5.21.6) and were able to connect just fine.
Is there any way around this? I found this question and answer, but I'm unsure if it's the same issue because the latest version of WinSCP works: Ubuntu 22.04 SSH the RSA key isn't working since upgrading from 20.04