ProFTPd - Fatal: Socket operation on non-socket

I was trying to set up ProFTPd on Ubuntu recently and for some reason it wouldn't start. Somehow the configuration had been messed up (or something had been). I uninstalled and reinstalled it, but still it wouldn't start.

While trying to fix this problem, I came across this brilliant FAQ:  Chapter 4. Common Running problems. This described all the problems I was having:
3. Unable to bind to port/Address already in use
5. "Fatal: Socket operation on non-socket"

It's great to see such a useful FAQ.

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