I also get same problem..
I have a fresh installed cwp 9.8.240.
Then I install and configure CSF firewall..
Then i try to open my website, i've got 500 internal server error.
I pretty sure this happen because htaccess not working, because i got error when install wordpress. it says mod_rewrite doesn't work.
How to fix this? why a fresh installed CWP will get this error?
Thanks