After opening multiple sites in WordPress, the solution is to solve the problem that some site backends cannot log in normally and keep jumping back to the login page.

For a WordPress website with multi-site mode turned on, the backend of some sites cannot log in normally and always jumps back to the login page. The login url becomes: http://www.xxx.com/wp-login.php?redirect_to =http://www.xxx.com/wp%2Dadmin/&reauth=1, the solution is to modify WordPress Cookies settings.

Open the theme's functions.php file, add the following code at the end of the file and log in again.

setcookie(TEST_COOKIE, 'WP Cookie check', 0, COOKIEPATH, COOKIE_DOMAIN);
if ( SITECOOKIEPATH != COOKIEPATH ) setcookie(TEST_COOKIE, 'WP Cookie check', 0, SITECOOKIEPATH, COOKIE_DOMAIN);

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