Redmine

I am new with Redmine, and i don't installed this one.
After a lot of searching i still have the problem that redmine start with http and show main page. When i want to login redmine change to HTTPS://XXXX/login. If look every setting but all redmine settings say not to use SSL.

Because we must put Redmine behind a reverse proxy it is nessecarry to turn of SSL for redmine, also for login.

btw: After Login i can use all sites with HTTPS or HTTP.

Thanks a lot
Uli