I have been testing Wordfence on a few sites because if I can get it to work reliably I would like to use it on all of my sites. I have been running to some issues though with the scans get stuck and just spinning. This is happening on 3 of the 5 sites I have it installed on.
The message in the Scan Detailed Activity in the dashboard is: Wordfence can't get the IP of clients and therefore can't operate
The note in the error.log of the site is: Premature end of script headers: admin-ajax.php
On the 4th site, I get the same error message in the Scan Detailed Activity, but then it will get the correct IP, work for a little bit, but then go back to not getting the correct IP.
I get the same error in error.log plus this one: File does not exist: /home/[ftp-user]/[site]/internal_error.html
On the 5th site it is working fine.
Any thoughts on how to fix this? I would really like to be able to use this plugin on all of my sites.