i hope somebody can

Hi, i hope somebody can help me :slight_smile: I have a multisite with the domain http://www.domain.de as main domain. now i wanna activate ssl via lets encrypt. After activating ssl on the domain https://www.domain.de i can not relogin to my site. the site is always reloading. What do i have to do when i wanna activate ssl in details and what do i have to change. Thnak you so much for help!