If an SFTP transfer is interrupted for any reason, when the connection resumes, the transfer will have to start over from the beginning. SFTP will work fine for small files, but if you're going to transfer files that might take hours or days, FTPS is the better solution. The real advantage of FTPS is that when a file transfer is interrupted, the file transfer will resume where it left off once a connection is re-established. I would recommend using FTPS (uses an SSL, and default traffic is over TCP port 443). Make sure you're on SSH v2 if you take that route. While SFTP does have its uses, it uses SSH.
You need to make absolutely certain that you're blocking TCP port 21 (normal, unsecured FTP), and that you disable anonymous logins over SFTP/FTPS. And many other reasons Well, now let’s see what we need to do to disable the firewalld.I would urge caution on using SFTP or FTPS if you're planning on exposing this traffic to the interent. We may want to use other firewalls on our system. Sometimes the configuration file may not be set correctly or it may not be adapted to the desired conditions, in this case, it is necessary to disable the firewalld. For this reason, it may be better to configure open ports firewall-offline-cmd before enabling the firewall on more complex production systems. Sometimes when there are connection problems, one of the first things that should be done is to temporarily disable the firewall. The answer to this question is very simple. You may ask why sometimes you may need to temporarily enable or disable the firewall.
This tutorial will teach you how to Start /stop and enable/disable the firewalld. firewalld is written in the Python programming language and is licensed under the GNU GPL 2 license. Firewalldis a lightweight and popular command-line firewall for Linux servers and desktop systems used on many Linux servers and machines today.
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