I'm having the same issue described here. I've tried the working solution but it hasn't worked for. In config.local.php I have
$env_config['cookie_domain'] = 'buckley.dev'; and I am still unable to login. This site is using the focuslab multi environment config set up in case that is relevant.
This was working last night when I installed EE 2.8.1 but when I tried to login this morning it won't let me. I am also unable to log in to the staging site.
I have also tried logging in with Firefox unsuccessfully.
In config.master.php I have the following
//$env_config['cookie_domain'] = ""; $env_config['cookie_path'] = ""; $env_config['cookie_prefix'] = "bulkley"; $env_config['admin_session_type'] = "c"; $env_config['user_session_type'] = "c"; $env_config['require_ip_for_login'] = "n"; $env_config['require_ip_for_posting'] = "n"; $env_config['secure_forms'] = "n";
Also I am able to login via a front end form so I know my user/password are correct. I am however unable to access the CP.
Interestingly if I login via the CP (and get redirected) and then I view the front end of the site when previously logged out, I am now logged in. So the issue isn't that I'm not logging in but that I can't access the control panel when logged in.