Step::1 Login to your cPanel account and start searching for the File Manager icon under the FILES section.

Step::2 After opening the file manager click on public_html directory.

Step::3 Find the .htaccess file and right-click to Edit.

Step::4 After choosing an edit option, you see a popup asking to disable encoding if you wish. You have to click on the Edit button to continue.

Step::5 On a new tab, you can see many rewrite rules. You have to add the code to the .htaccess file.
<IfModule mod_security.c>
SecFilterEngineOff
SecFilterScanPOSTOff
</IfModule>

Step::6 Save the file by clicking on the Save Changes button from the top-right corner of the screen.

Congratulations!! You have learnt how to Fix 406 or Not Acceptable error using .htaccess in cPanel

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