Hello there,
It has been a while since you asked the question but I had the same issue with my site and I found a solution, so I wanted to share it with you.
It is a hosting side error, not related to the plugin.
The configuration of ModSecurity (in your server) matches the url pattern and denies access. If you want/can to see your logs in the server you will find something like this: ModSecurity: Access denied with code 403 (phase 2). Pattern match “(?i:\\\\b(?:t(?:able_name\\\\b|extpos[^a-zA-Z0-9_] ….
To fix this you have to configure the ModSecurity. Try to give the url pattern to your hosting provider and ask to be removed/excluded from the rules.
Also check the SSL/TLS support general configuration.
Hope this helps,
Alex
