Webdav connection error: 1) destroying session after redirect to https and 2) 405 method not allowed

HI, I have trouble setting up a working connection with WINSCP to my NAS using WebDAV. On this NAS I enabled WebDAV via https: incl specific port (forwarded). The corresponding log is attached. I hope someone can have a look at it. And advise how to solve...thx

Your WebDAV server seems to redirect to an HTML login form. That's not a right behaviour. Can you connect with any other WebDAV client?