Login problem after change custom_base_url

Hi, I cant login to admin after set custom_base_url in system.yaml. or thru web-admin.
What Im doing wrong?
Thank you

Hi, Thank you for response..

I use Grav on alias.. so after click each link .. the url look-like this..

http://www.mydomain.com/domains/mydomain.com/home

Change base will fix it.. to http://www.mydomain.com/home, but I cant login... the guide did not help. .. what Im doing wrong.. thank you

@freebeart, I'm a noob on infra, so I can't really help you...

But you did.... Session was the problem... if i corrected the path.. it is o.k now.. Thank you very much pamtbaau

@freebeart, Are you saying you didn't follow the guide correctly...??? ;-)

Anyway, good to know it as been fixed. Please mark the questions as 'solved' by ticking the 'solution' icon in one of the replies.