Not able to Block IP address

Hi, I am trying to block few notorious ips through .htaccess and wordfence. Unfortunately, since I use server and browser-side caching, none of these are working. Can you suggest a workable solution?

Thanks in advance..

• This topic was modified 3 years, 5 months ago by Jan Dembowski. Reason: Moved to Fixing WordPress, this is not an Everything else WordPress topic