After migration of WordPress website I can't access the admin (white page)

Question

I am trying to move a WordPress site from my local server to the online server. The problem is that, after the migration, if I try to open the administration page (wp-admin) I only obtain a white page, as you can see here: http://scorejava.com/wordpress/wp-admin/. Everything else seems work well in the homepage: http://scorejava.com/wordpress/. In my local web server I have the WP site into the folder: `/var/www/wordpress`. I have moved it into a wordpress folder that is into my root directory of my online web server. I have also import the local database into the onlyne database using MySql and then I have use the Search and Replace for WordPress Databases Script to change automatically all the `http://localhost/wordpress` occurrence into the database tables with http://scorejava.com/wordpress/.

Accepted Answer

There is an error on your site, and you need to find out what's happening.

WordPress URLs

When migrating WordPress sites where the URL changes, you will need to tell WordPress about the new URL. WordPress stores that information in the database, so if you're comfortable with that, you could find the correct entry in the `wp_options` table in your database and update its value.

I will show some fixes for standard WordPress installs (where the site URL is the WordPress root), but you may need to use different values for `home` and `siteurl` if you have a different setup.

Fix URLs via SQL

You will need to update the relevant fields in the DB, those being the entries of `wp_options` where the `option_name` is `siteurl` or `home`. You can find these fields using phpmyadmin, mysql-workbench, or another database management tool, or you can use the following query, changing the URL to be your own.

```
UPDATE `wp_options` SET `option_value`='http://www.myurl.com' WHERE `option_name` IN ('siteurl', 'home');
```

Fix URLs via `wp-config.php`

However, you can also do this via `wp-config.php`, which I find to be much more comfortable. Just open `wp-config.php` and add the lines:

```
// Site URLS (override DB settings)
define('WP_HOME','http://www.myurl.com');     //<-- NO TRAILING /
define('WP_SITEURL','http://www.myurl.com');  //<-- NO TRAILING /
```

Obviously you'll need to supply your correct URL.

It's possible that this is the only error you're having, and after adding those lines to `wp-config.php`, you will be able to log in and use your site normally.

Debugging WordPress errors

However, if you continue to experience problems, and any time you're working on developing a website, you will want to see error output. You can check your server logs for information about the errors, but you may find it more convenient for WordPress to simply display the errors in the page. To enable error display, change the following setting to `true` in `wp-config.php`.

```
define('WP_DEBUG', true);
```

Now WordPress will display any errors it encounters directly in the webpage. Be sure to change the setting to `false` for use on a production site.

Working with `wp-config.php`

This file will be located in the root directory of your wordpress installation. To make any of the changes mentioned here, you may either edit the file directly on the server (via `ssh` for example), or download the file with an FTP client, make your changes using a text editor, and upload the file again.

It's also a good idea to keep a backup copy before making any changes in case you break something while you're working.

References

You can read all about changing the WordPress site URL on the docs page.

After migration of WordPress website I can't access the admin (white page)

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