Issue: Restarting pure-ftpd in a CentOS based, cPanel server displays the following error message, and some clients are having FTP connectivity issues:
(?@?) [DEBUG] Couldn’t load the DH parameters file /etc/ssl/private/pure-ftpd-dhparams.pem
Solution: Generate the dhparam file (Diffie–Hellman (D-H)), and restart the FTP server.
SSH into server and execute the following commands:
openssl dhparam -out /etc/ssl/private/pure-ftpd-dhparams.pem 2048 /scripts/restartsrv_pureftpd