There was a similar post to this, however the solution did not work for me.
I am having some difficulty logging into my WordPress site. When I attempt to visit example.com/wp-admin, I see the login page as per usual, however, once I enter my login details, the page essentially reloads and the url changes to:
This is a loop which I cant pass beyond. The front end of the website seems to be working as per usual. Visiting example.com/wp-login.php and entering my login details has the same behaviour as listed above.
I have confirmed this is not a problem with anything on my local machine as the behaviour persists across multiple browsers, devices and networks.
As suggested by others, I went into PhpMyAdmin > wp_usermeta > and deleted the meta_value for session_token. This did not fix the issue.
I turned on DEBUG and was provided with the following items when loading example.com/wp-login.php:
Warning: Cannot modify header information – headers already sent by (output started at /home//public_html/wp-includes/wp-db.php:1308) in /home//public_html/wp-login.php on line 425
Warning: Cannot modify header information – headers already sent by (output started at /home//public_html/wp-includes/wp-db.php:1308) in /home//public_html/wp-login.php on line 438
I have found numerous forum posts about the issue but none offer a satisfactory solution.
Please help as I urgently need to update content on the site.
“Headers already sent” errors are frequently caused by plugin conflicts. Since you have access to phpMyAdmin, you could try emptying the
active_plugins data from the
options table. (But first I would copy and save the
option_value elsewhere for resetting it if it doesn’t help.)
I had similar problem with getting into admin area of a wordpress site. My problem was solved by downgrading PHP version on my webserver from 7 to 5. Some plugins could not work properly under PHP 7. So after downgrading I deactivated all of them and upgraded PHP to 7 and it was working.