Troubleshoot

This guide is dated, but I found it useful when trying to figure out why SSH keys wouldn't work.

Windows as SSH Server

With Windows acting as the SSH server:

Open up Windows Event Viewer.
Navigate to the path: Event Viewer (Local) > Applications and Services Logs > OpenSSH > Admin > (wait a minute) > Open SSH Event Viewer.
Review the log based on timestamp of the events.

I've encountered a number of problems due to how SSH key file/folder permissions is handled in Windows.

For Windows SSH servers, make sure authorized SSH public keys is formatted using utf-8, and CRLF for line ending format.