After upgrading ProFTPD to version 1.3.8 one may see the error:
mod_sftp/1.1.1: Server 'ProFTPd': Cannot support both FTPS (TLSEngine on) and SFTP (SFTPEngine on) for the same host
Here's a guide on how to fix this on a server with DirectAdmin.
Important: The steps below will disable FTP on your server, forcing you to use SFTP with your FTP-credentials. Do not follow the steps if you are not sure you understand all the consequences.
perl -pi -e 's/TLSEngine.*/TLSEngine off/' /etc/proftpd.conf
and restart proftpd:
systemctl restart proftpd
Copy the update file to the “Custombuild” folder to allow the changes to persist in future updates:
mkdir -p /usr/local/directadmin/custombuild/custom/proftpd/conf/ \cp -p /etc/proftpd.conf /usr/local/directadmin/custombuild/custom/proftpd/conf/
Second solution: SFTP with FTP
It is expected that ProFTPd on the server is already compiled with support for sFTP and that a file /etc/proftpd.sftp.conf exists on the server.
If you still need SFTP with FTP on the same server, you can install an updated configuration from the link:
Run the following commands as root to install the updated configuration from Poralix's GitHub repository on the DirectAdmin server:
mkdir -p /usr/local/directadmin/custombuild/custom/proftpd/conf/ cd /usr/local/directadmin/custombuild/custom/proftpd/conf/ wget -O proftpd.conf
And then reinstall proftpd:
cd /usr/local/directadmin/custombuild/ ./build proftpd