I came across an error recently that users were getting when trying to login to book events on a wordpress site. The error was:
“Hack tool, please contact support”
That didn’t look great, and some users thought their machines were compromised. Having looked in to it, it’s a problem with the headers in the .htaccess file. To resolve this error (I’ve seen a number of users with this issue), add this block to your .htaccess file.
<ifModule mod_headers.c> Header set Set-Cookie wordpress_test_cookie=WP+Cookie+check </ifModule>