ok., my settings are similar. can you check that
>Erweiterte Einstellungen: EAP: Man Benutzern. verwenden< is set and that >Zertifikat< is set to keine?
so just for record. Some of us are pointed to
https://wiki.ow2.org/sync4j/Wiki.jsp?page=HowtouseHttps
which tells only the half of the trues. The other part to get https working is...