'Page isn't redirecting properly' errors on wp-admin

Website, Application, Performance DNS & Network
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3

First thing, make sure that at WordPress General settings, you have HTTPS version URL, not HTTP.

You can verify once by checking MySQL database table. If there is HTTP, you may change to HTTPS.

Or if you need very fast solution, simply define HTTPS version URL via wp-config.php

define('FORCE_SSL_ADMIN', true);
// in some setups HTTP_X_FORWARDED_PROTO might contain 
// a comma-separated list e.g. http,https
// so check for https existence
if (strpos($_SERVER['HTTP_X_FORWARDED_PROTO'], 'https') !== false)
       $_SERVER['HTTPS']='on'; 

define('WP_HOME','https://example.com');
 define('WP_SITEURL','https://example.com');
 /* That's all, stop editing! Happy blogging. */

Then try to access, it should work. If it works, better, at last you can use Search/Replace to fix.

Also, one more thing. Make sure you don’t have vice-versa redirection in the .htaccess

#####Ref

  1. Changing The Site URL « WordPress Codex
  2. Administration Over SSL « WordPress Codex
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