Hi,
Thank you very much! Unfortunately the issue seems to be unrelated to the plugin, as it persists, even if the plugin is disabled, please see:
– Disabled ajax search pro: https://i.imgur.com/DiPWLi8.png
– Doing a regular search on this URL still causes the issue: https://i.imgur.com/F70sVkL.png
I recommend checking the server configuration, firewall, .htaccess and .htpassword configurations, as well as any security and other related measures if any of the requests is not blacklisted. Turning off plugins one by one, and switching the theme may also help determining what might be causing the issue.