I am experiencing the same on our site with the same setup - http for frontend, https for admin.
On this particular hosting I have to use to force https redirection (i don't use this actually for CMSMS but for different application)
Code: Select all
RewriteCond %{ENV:HTTPS} !^.*on
Code: Select all
RewriteCond %{HTTPS} on
Edit: the workaround with removing $config['root_url'] and $config['ssl_url'] works here also.