i have this problem working locally on a friend website.
first of all it is old, very old, wp version is 2.9, runs php 5.5 but not higher.
did localy the update to 4.8 and seems to be ok.
but, before and after the update it is impossible to access to the admin page, the browser goes to the adress mysite.com/wp-admin adn then goes straight to the online site telling me wordpress is up to date.
before the update i was sent to the index page of the online website.
so i cannot access the admin page locally.
any ideas ?