I have updated the WordPress site from 4.2.9 to 4.4.1 today. Now, after update the home page is going into redirect loop. The inner pages/posts , admin dashboard and all works fine. Only issue is with homepage.
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There is number of possible way to coming this issue with message "net::ERR_TOO_MANY_REDIRECTS". I list some of them:
1. File/Folder permission issue Check and changed the permissions of wp-login.php to 644, if the WordPress login page has this issue.
After this, another redirect loop? So, once again, looking at /wp-admin/index.php, the permissions were 664 rather than 644.
You can check more about Permission Scheme for WordPress(https://codex.wordpress.org/Changing_File_Permissions)
3. Affected by external plugin use Please check this by rename your every external plugin folder and rollback if it show up one by one.
4. Regenerate you .htaccess by paste code from Options -> Permalinks Also make sure everything is in lowercase.
Hope you can find your solution from this.