Try setting
https://winscp.net/eng/docs/library_session#executableprocesspassword
See this related problem:
https://winscp.net/eng/docs/message_library_timeout_waiting_to_respond
Session.ExecutableProcessUserName
and the Session.ExecutableProcessPassword
:
https://winscp.net/eng/docs/library_session#executableprocesspassword
See this related problem:
https://winscp.net/eng/docs/message_library_timeout_waiting_to_respond