I just wasted about two hours of my life troubleshooting my development server when I mysteriously couldn’t SFTP files. Transmit and Flow both quit on me in weird, somewhat inconsistent ways. The problem: I had lazily allowed VirtualMin to set quotas, one in particular on the user account I was SFTPing with.
Careful with those quotas. And that’s the blog post you’ve been waiting ~3 months for.