One of my users is having trouble logging into cPanel. His IP had been flagged by CSF and banned via iptables, and I fixed that with 'csf -a $IP'. I have confirmed that his IP is now accepted by iptables and he is able to interact wwith the server. Ever since then, however, he has had to perform a password reset to get in. Once he has reset his password, he can log in. If he logs out or closes his browser, his new password won't work and he'll have to do another password reset to get back in. How can I fix this, or where can I start troubleshooting this?