I need help with webDav & Exchange server

Hello,

I’m working on a project with Webdav and exchange server and i have a problem. I have Webdav code to create a new folder on my exchange server(which is linked to MS Outlook). But when i try to connect i get this error message saying that i can’t create a trusted connection with the SSL channel. Does anyone know what to do ? I’m desperate…

Greetings and many thanks