SCP tunnel broken in version 6.5

I use a tunnel to connect through a main device to get to a device on a local internal ip address. This has always worked until I installed the latest version(6.5) today. I reverted back to version 6.3.7 and I am back up and running again.

Thanks for your report.
Please post logs from both versions.

Where do I find the logs you want?

Please configure the logging in Preferences:
https://winscp.net/eng/docs/ui_pref_logging