How to troubleshoot 404s in WordPress admin

404 is failure to communicate with the server. So either your configuration is not complete for the new server (for ex: permalinks), or your server needs optimization. You could try checking the server error log or php error log first.

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)