Re: keyboard Authentication
First, you need to upgrade urgently. 4.1.8 is over 8 years old! It's not secure to use it!
Also, can you connect with any other SFTP/SSH client? E.g. PuTTY? Show us logs both from WinSCP (the latest version) and PuTTY (its event log).
Also, can you connect with any other SFTP/SSH client? E.g. PuTTY? Show us logs both from WinSCP (the latest version) and PuTTY (its event log).