You MUST use binary mode with FTP or SFTP least you find your images all messed up and probably other stuff.
Marek Muc wrote: ↑
Mon Sep 07, 2020 6:30 pm
3. What SFTP clients do you use for phpBB transfers and would recommend?
I use the free FTP client called WinSCP. It defaults to binary mode from the jump so no need to mess around with it. I also like its features, and can navigate an Amazon AWS S3 bucket resource as well, though in my use it's slow. The other FTP client that can access an S3 resource, WebDAV, FTP, SFTP, etc is CrossFTP, but I think it's payware.
Never mind, that's just for the Pro/enterprise version.
FTP (File Transfer Protocol) uses port 21 by default.
SFTP (Secure File Transfer Protocol) uses port 22 by default.
If you're using SFTP, make sure it's using port 22 as that is the default. 22 is also the SSH (Secure Sockets Host) port. I think the same crypto is being used here.
For future readers:
If you own a bare metal server or VPS, then of course these default ports can be changed, and I highly recommend they are from a security standpoint. Port knocking would be prudent if possible. The installation of Webmin can help change the default ports via point and click. Though, the webmin port its self should be changed too.