The 406 error is probably a result of a Security error with the Mod Security. You can temporarily turn it off in the cpanel until you finish your changes, then re-enable it. Check out this article for more information on using Mod_sec and it will also give you the information on how to turn it off.
Use your Mod_sec to protect your site
You can also refer to this article:
Disable Mod Security
If you require further asstance, please go to Technical Support Contact
Try this first and leet us know if the problem persists.
If you have any further questions, please contact technical support or leave a comment at the bottom of the page.
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