admin backend icon fonts missing

Open up app/etc/di.xml find the path

<span class="typ">Magento</span><span class="pln">\Framework\App\View\Asset\MaterializationStrategy\Symlink</span>

1	<span class="typ">Magento</span><span class="pln">\Framework\App\View\Asset\MaterializationStrategy\Symlink</span>

and replace it with

<span class="typ">Magento</span><span class="pln">\Framework\App\View\Asset\MaterializationStrategy\Copy</span>

1	<span class="typ">Magento</span><span class="pln">\Framework\App\View\Asset\MaterializationStrategy\Copy</span>

Note: Remove entire files and folder under pub/static except .htaccess

Magento 2 icons not showing on frontend