Solution 1 for Fixing 406 Error
Backup your .htaccess file if you have one in the ‘wp-admin’ directory. Then make a ‘.htaccess’ file with the following content and upload it to ‘wp-admin’ directory.
<IfModule mod_security.c>
SecFilterEngine Off
SecFilterScanPOST Off
</IfModule>
You can use any text editor such as Notepad to create this file.
You will need to upload this .htaccedss file to your server. So if you don’t know how to upload a file to your server then check this tutorial on FTP.
Solution 2 for Fixing 406 Error
This is the solution that worked for me for my WordPress site.
Backup your .htaccess file if you have one in the public_html directory.
Open the .htaccess file with any text editor and observe the lines between the “# BEGIN WordPress” and “# END WordPress” tags. Make sure the lines look somewhat like the following. If not then update the file with the following content and upload it to the ‘public_html’ directory.
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress
Hopefully one of these solutions help fix your “Not Acceptable” error.
