OK, I figured out my issue. The Plesk update overwrote the part of my proftpd.conf that included my passive ports. Once I put that back in everything is working fine for me again.
Hello, This update has broken FTP on our server. I tried commenting out the "/etc/proftpd.d/*.conf" line in our /etc/proftpd.conf and restarting xinetd but when I try to connect with FTP it just times out while waiting for the directory listing. Not sure what to do next.
# rpm -qa | grep...